Hunting corporal Kevin Duke
New objective: Go to a Blacknet terminal
Go again to location [761, 226]. Same as before you have to approach the terminal masked as a soldier or a scientist, remembering about avoiding viral detectors. Use the terminal again (B button).
New objective: Hunt and consume corporal Kevin Duke
Act the same as with the previous hunting, so get to the rooftop of one of the highest buildings in order to locate the corporal. Kevin Drake is one of soldiers defending themselves near sandbags in location [765, 305]. Similarly to the character from the previous hunting, you can give up the disguise and rapidly consume the corporal, stealth eliminate all soldier accompanying him or wait until soldiers turn back and then grab Drake.
Defeating the goliath
New objective: Go to the containment site to watch Blackwatch's Goliath capture
Head to location [569, 398]. Once you approach it, the game will display a cut-scene showing the release of the goliath. Your task is of course to defeat him.
New objective: Defeat the goliath before it destroys the city
The fight with the goliath can be played in two ways. If you do not mind to slowly reduce its health points, then you can attack it with the rocket launcher for example (there are many persons with such weapons standing on rooftops of adjacent buildings) or hijack hostile helicopters.
I personally recommend the tactics based on targeting particular parts of goliath's body (similar to the battle fought in 21st main mission - Fall from Grace). At the beginning start with standard attacks but watch out for goliath's charges (screen above) - it is best to avoid them by escaping to the rooftops.
The fight with goliath is about weakening his four body parts. First of them is his head (screen above). Remember about using best direct attacks, because if you do not make it to empty his head's energy bar, you'll have to wait for the second occasion.
The second and third body parts are goliath's limbs (screen above). Particularly important is the first of limbs, because destroying it will reduce boss's mobility (but he can still perform large jumps).
The last part of goliath's body is his reversed head (screen above). Destroying it results in defeating giant mutant. During the fight remember about avoiding attacks of Blackwatch soldiers and helicopters (especially rockets shot at you). And regenerate regularly.
New objective: Consume the goliath before it destroys the city
Quickly run to the wounded goliath and consume him by pressing B button. After that action do not forget about leaving the area, because soon it will be full of enemy forces.
Hunting Elwood Pine
New objective: Go to a Blacknet terminal
Once again go to location [761, 226]. Same as previously, you should approach the terminal masked as a soldier or a scientist, remembering about avoiding viral detectors. Use the terminal again (B button).
New objective: Hunt and consume Elwood Pine
Act the same as with previous two hunts, so get to the rooftop of one of the highest building in the area, to locate the person you're looking for. Elwood Pine stands near the group of Blackwatch soldiers in location [639, 231] and you can attack him right away because he has virus powers and can't be consumed in a standard way.
Defeating Elwood Pine
New objective: Defeat Elwood Pine
New objective: Consume Elwood Pine
The fight with Elwood doesn't particularly differ from other duels with evolved enemies. So try to use quick attacks and dodge Pine's blows. You can also try to take the rocket launcher from one of enemies or tear off the launcher from the tank. After winning the fight go to heavily wounded Pine and consume him.
Getting to the Gentek facility
New objective: Go to the Gentek facility to kill Mercer's infected specimens
Your next destination is location [415, 281] and since it is a military base, it would be good to approach it disguised as a soldier or a scientist.
New objective: Consume the commander to access Gentek's specimen facility
New objective: Use the hand scanner to enter Gentek's specimen facility
The commander stands on the rooftop of the main building in location [399, 269] and he shouldn't be guarded by anyone so you can consume him right away. After that action, head to the hand scanner in location [393, 289].
Defeating the infected
New objective: Release the infected so you can kill them
In order to release the first of two groups of infected, you have to use the control panel in location [403, 298]. It is worth noting that this action will expose Heller so I would recommend eliminating nearby soldiers first.
Take few moments to familiarize yourself with newly unlocked bonus objective. You'll have to consume five infected monsters and since there are six beast in total (three per group), only one of them can be omitted. In the first group you'll find two brawlers and juggernaut (screen above).
Start attacking brawlers and use the best tactics against them, so jump over them. Only after defeating brawlers deal with juggernaut, avoiding his attacks. Since the beast is quite slow, it is worth running between two down rooms, because brawlers will be joining you quickly.
During the battle I strongly recommend not using the special attacks. Since the rooms are relatively small, it would be difficult to distinguish your brawlers from hostile ones after using Pack leader attack and the Devastator may prematurely kill some monster. Do not forget about grabbing soldiers running in the area and consuming each of defeated main beasts.
After defeating the first group of mutants, return to the control panel and use it again. This time you'll release one brawler and two juggernauts.
I suggest starting the fight with defeating brawlers and after that focusing on attacking juggernauts with some powerful area attacks. Keep consuming monsters and if you see that you'll be not able to complete bonus objective, consider replaying the fight from the very beginning.
Leaving Gentek facility
New objective: Exit the Gentek facility
The only thing left is to leave the base, so head to the elevator in location [396, 271] (remember to stay masked as a scientist or a soldier). Once you leave the building, the mission ends. Notice, that as a reward for completing the mission you can choose a mutation from category Power Specialist. And as a reward for completing the last mission you can choose a mutation from category Offensive.