General assumptions: You must use all three disguises available in the thirteenth game mission.
Factory guard disguise can be easily obtained in each stage. Additionally, in the Patriot's Hangar stage, you can find ready-to-wear disguise on the other side of the hangar, so theoretically you do not even have to attack anyone.
The Patriot's costume is unique, because you have to stun or kill Patriot in the Patriot's Hangar stage. It is best to distract him with throwable items and eliminate him in any secluded place.
Patriot's entourage disguise can be obtained in each stage. In the Patriot's Hangar stage you have to attack one of Patriot's men. In the The Arena stage you can find a ready-to-wear disguise in the VIP box.
General assumptions: You must find two evidences.
The first evidence can be obtained in the Patriot's Hangar stage. It is located on the other side of the hangar, in the corner guarded by a single enemy. You can distract him or use disguise.
The second evidence can be obtained in the The Arena stage. The secret is located in the VIP box. You can get inside disguised as factory guard and distract a single guard or (better idea) use Patriot's costume.
General assumptions: You can't be spotted. In order to complete this challenge in 100% you have to do this in both stages of the thirteenth mission. You shouldn't have big problems with that, assuming that you carefully watch opponents' moves and use disguises when needed.
General assumptions: You can't use disguises. In order to complete this challenge in 100% you have to do this in both stages of the thirteenth mission. Completing the first stage without disguise is quite easy, but you may have problems in the second stage. First of all, remember not to use Patriot's costume. You should also spend as less time as possible on upper arena levels.
Lost and Found
General assumptions: Find the keycard lost by one of guards.
This is very simple challenge and its completion is required if you plan to eliminate Sanchez in a traditional way. The keycard can be found among boxes behind the camper, where Patriot is training (Patriot's Hangar stage).
A Real Patriot
General assumptions: Stun Patriot, hide his body and wear his costume, while remaining undetected.
It is not demanding challenge. You can complete it after deciding to meet Sanchez on the ring. Start using throwable objects near the Patriot's camper (Patriot's Hangar stage) trying to distract him (screen above).
Wait, until Patriot gets to some secluded place and then stun him and hide his body in a nearby container.
Now put on his costume. Note - this challenge will be accomplished only if none of enemies in the hangar is alerted.
General assumptions: Put on Patriot's costume and fight Sanchez on the ring. Description of this variant can be found in thirteenth mission walkthrough, specifically in Patriot's Hangar - Using Patriot's clothes and The Arena - Fighting with Sanchez on the ring subchapters.
General assumptions: Defeat Sanchez on the ring without missing any QTE.
This is quite easy challenge. You have to perfectly perform all QTE scenes during the fight with Sanchez (follow on screen instructions). If you miss any of them, pause the game and reload last checkpoint to try again.
General assumptions: You have to eliminate Sanchez as result of arranged accident connected to arena lights.
This challenge can be completed in the The Arena stage, but you have to decide to traditionally kill Sanchez instead of fighting him in the ring. Go to upper balconies and use one of passages heading to the arena rooftop. First passage is located near the stairs (screen 1) and another - in the VIP box (screen 2).
Eliminate or avoid enemies on your way. Eventually you have to reach a mechanism shown on the above screen and use it, lowering the lighting boom on the arena.
General assumptions: Eliminate Sanchez with a sniper rifle, while remaining undetected.
This challenge can be completed in the The Arena stage, but you have to decide to traditionally kill Sanchez instead of fighting him in the ring. To obtain a sniper rifle, access the armory shown on the above screen. Eliminate guards inside (or use Instinct), go to the right room and pick up Ilyon R700 sniper rifle.
Now go to the room shown on the above screen, located near two guards leaning over the railing.
Place yourself neat the shutter, wait for a proper moment and shoot. Note - if the challenge is not completed, try to eliminate all enemies patrolling upper levels first, because you must stay undetected. Also make sure that you've killed only Sanchez, because no one else may die as a result of your attack.
General assumptions: Murder Sanchez with explosives.
This challenge can be completed in the The Arena stage, but you have to decide to traditionally kill Sanchez instead of fighting him in the ring. It is best to use remote explosives or C4 bricks and if you do not have any explosives with you, you can find them in the left room on the armory (screen above).
Once you get explosives, go to metal balconies on the first floor of the arena. Place yourself at the railing, near the entrance to the VIP box (screen above). Now throw the explosives over the cage and wait for the explosion or use the detonator.
General assumptions: Complete Untouchable, Light Rig, Wing Man and My Enemy challenges, connected with eliminating Sanchez in different ways.
How the Might Fell
General assumptions: This challenge is automatically unlocked after completing the Fight Night mission.