This chapter includes a complete list of all 50 achievements available in the Xbox 360 version. They are the counterparts of Trophies in the PlayStation 3 version and Steam Achievements in the PC version.
1. First Riddler Trophy
You need to obtain the first trophy, which becomes possible after you have collected all two hundred Enigma Datapacks and destroyed all 70 Network Relays. Return to Enigma's hideout and gain access to the concealed room. The entire process has been described on the Enigma page, in the Most Wanted part of this guide.
While fighting Deathstroke (one of the game's bosses) you need to initiate all counter-attacks flawlessly. You can find a detailed description of this fight in the chapter of this guide entitled Main Bosses and in the description of the main campaign mode.
You need to complete all nine Most Wanted side-missions.
Point to Point
You need to glide over the Gotham Pioneers Bridge without touching to the ground. It is a very easy achievement because you only need to use the grapnel gun to grab onto the elements of the bridge, which will catapult Batman. You should only make sure that you do not land onto one of the bridge's platforms and glide under them, whenever possible.
You need to complete the predator room (the area where Batman operates stealthily) using the silent takedowns only, i.e. the melee attacks launched by surprise. The best moment to do that is soon after the beginning of the game, because the initial predator rooms are the easiest to secure.
I've Got This
You need to purchase all the available upgrades (Close Combat upgrades and the Invisible upgrades). This means that you need to collect the required number of experience points to reach the highest possible experience level.
What Hit Me?
You need to attack 100 enemies by surprise, who are oblivious to the threat.
Around the World
You need to use all the fast-travel points in the game.
You need to win the fight with Shiva (one of the two bosses connected with the side missions in the game) without taking damage. You can find a detailed description of this fight in the chapter of this guide entitled Main Bosses and in the description of the main campaign mode.
Thanks, Old Friend
You need to have all of the optional conversations with Alfred. It is worthwhile to return to the Batcave on a regular basis (e.g. after each longer outing for a storyline mission), and hope that, initiating a conversation, starts a longer talk that counts for this achievement. It is worth noting that each such chat with Alfred is rewarded with several thousand experience points.
Voice of the People
You need to scan 20 out of 24 Anarky's tags. The whereabouts and methods of scanning these paintings have been presented in Anarky's Tags.
In multiplayer, you need to start playing when the server is full. Defeat the enemy hero to regain control over your gang but, you need to do that with no reinforcements.
You need to achieve the maximum overall level in multiplayer.
One Down, Several to Go
You need to complete any of the Most Wanted side missions.
One of Each
Within a single combination, you need to use every one of Batman's gadgets. What is even more, it is required that you do that in the Free Flow Focus mode so, you first need to unlock the Free Flow Power Gadgets upgrade.
You need to save Joker from falling. You will receive this achievement automatically during one of the main campaign missions.
One Eye Open
You need to win the duel with Deathstroke. You will receive this achievement automatically during one of the main campaign missions.
Everyone Wears Masks
You need to locate the Black Mask. You will receive this achievement automatically during one of the main campaign missions.
Free Flow Fifty
You need to achieve the x50 multiplier. The easiest way to do that is after you have unlocked the Shock Gloves and the Free Flow Focus.
You need to decipher one of the extortion files. The point is to receive one of the extortion file, i.e. find 10 Enigma Datapacks connected with it.
Anyone seen that?
You need to complete the predator room (the area where Batman operates from hiding) while remaining unspotted for the whole time. It is the easiest to attempt at this achievement somewhere at the beginning of the game, because the initial predator rooms are the easiest to secure. Use silent takedowns, gadgets, vantage points and venting shafts and the detective vision.
You need to achieve a level of prestige in multiplayer.
Legend of the Dark Knight
You need to complete all 60 challenges of the Dark Knight System. They have been described in the chapter entitled Challenges.
You need to destroy all 10 Network Relays in any district of the city. On the Network Relays page, you can find the whereabouts of all Relays and includes hints on how to find them.
I Like Those Odds
In multiplayer you need to defeat four elite enemies within 40 seconds, perform this as a hero and avoid direct melee blows. This, of course, means the necessity to relay on Batman's gadgets and the other, more advanced moves.
In multiplayer you need to defeat six elite enemies, in six different ways, while playing as either Batman or Robin.
City of Assassins
You need to identify all of the hitmen hired by the Black Mask. You will receive this achievement automatically during one of the main campaign missions.
While playing as Batman, you need to receive all rewards on the original training maps, available from the level of the training console in the Batcave.
Perhaps Sooner, Perhaps Later
You need to defeat Joker. You will receive this achievement automatically during one of the main campaign missions.
You need to complete all 15 challenges connected with the Worst Nightmare path. These are the Dark Knight System challenges.
World's Greatest Detective)
You need to complete all 15 challenges connected with the World's Greatest Detective path. These are the Dark Knight System challenges.
In multiplayer you need to upgrade your weapon to maximum.
Nobody That Matters
You need to find out who the Joker is. You will receive this achievement automatically during one of the main campaign missions.
I Am The Night
You need to complete the I Am The Night mode, which unlocks after you complete the New Game Plus mode. The difference is that Batman only has one life and, in the case of failure, you will have to start over from the beginning of the game. So, do not take unnecessary risk and also, master all of the moves of your character, as well as all the boss fights.
You need to complete all 15 challenges from the Gotham Protector path. These are the Dark Knight System challenges.
The Innocent and the Predatory
You need to defeat all 8 Black masks assassins. Apart from the characters that you encounter during the campaign mode, you also need to stop two criminals connected with the Most wanted missions, i.e. Deadshot and Shiva.
While laying as Batman., you need to receive all of the rewards on the original campaign map, available via the training console in the Batcave.
Tales of Gotham
In multiplayer, you need to win a round on all maps in every faction.
You need to win all of the available cups in the Custom challenges, available via the training console in the Batcave.
You need to cover a total of 26 miles while gliding. Sooner or later, you will unlock this achievement anyways but., if you want to speed the process up, you can reach everywhere on your own, instead of fast-traveling.
Not An Ordinary Criminal
You need to collect, at least 4000 experience points in one mach in multiplayer , as an elite enemy.
You need to find all Enigma's collectibles, i.e. 200 Enigma Datapacks. You can find information on where to find them, in the chapter entitled Enigma Datapacks.
You need to stop 20 various Crimes in Progress. It is a good idea to deal with crimes from the very beginning of the game, because many of them are still easy then.
You need to complete all 15 challenges from the Shadow Vigilante path. These are the Dark Knight System challenges.
Crime Scene Investigator
You need to solve all 9 cases described in the Casefile Report.
You need to collect all of the possible cups in the Combat Training challenges, available via the training console in the Batcave. In total, there are 12 fights (you need to receive 3 in each) and further arenas are unlocked with your progress in the main campaign.
In multiplayer you need to achieve the highest level for Bane's faction.
Give Them Something to Believe
You need to complete the New Game Plus mode, which is unlocked after you complete the main campaign mode (at the normal or high difficulty level).
In multiplayer you need to achieve the maximum level for the Joker's faction.
Know Thy Enemy
In multiplayer, you need to defeat each enemy player at least once during a game.