Hunting Dr. Marcella Walsh
New objective: Go to a Blacknet terminal
In order to start this mission, you have to get to location [874, 1409]. Very important information is fact, that its activation point is located in the base inaccessible for civilians, so you have to consume a soldier or a scientist first, and then shapeshift. Find the Blacknet terminal and interact with it (B button), watching out for viral detectors.
New objective: Hunt and consume Dr. Marcella Walsh
As you probably remember, it is best to start the hunt with getting to the rooftop of one of the highest buildings in the area. Only then send an impulse (press left analog stick), so you'll easily find the location of the scientist you're looking for (screen above).
An exact location of Dr. Marcella Walsh in location [798, 1441] and she should stay in a public place, so you can approach him without necessity of being disguised.
Collecting the mutagen containers
New objective: Intercept the helicopter
Fortunately you do not have to race with the helicopter, because your only task now is to get to the shiny circle in location [756, 1404]. Once you step in the circle, the game will show cut-scene.
New objective: Collect the mutagen containers before Blackwatch gets them
Now you have to prepare for some kind of race, because your task is to pick up containers in certain time limit (there is a counter visible on the screen). First container can be found in location [760, 1387] and others are indicated by the game on ongoing basis. Notice, that after approaching each container (you do not have to press any button), time limit increases, but you can't afford any longer pauses.
During this "race", focus on safely reaching the adjacent buildings. It is best in such cases to start with strong bounce (hold A button) and then to rely on gliding (hold right trigger). There are some situations, when you will have to run over the walls and watch out then not to fall down. You should also remember that during gliding you can press A button to perform so-called dashes that help you to approach rooftops of more distant buildings.
In order to complete that mission, it is not required to have fully developed all acrobatic abilities, although they can reduce the race difficulty. Watch out at the end of the race (screen above), because if you can't perform very long jumps, it is better to bypass the water area from the left side, not risking wasting valuable seconds.
Continue collecting containers, reaching after few moments the last of them and finishing this level. Watch a new cut-scene and wait for instructions.
Hunting sergeant Emery McDonald
New objective: Go to a Blacknet terminal
Go again to location [874, 1409]. Same as previously, you must get inside the base disguised as a soldier or a scientist, remembering about avoiding viral detectors. Interact with the terminal again (B button).
New objective: Hunt and consume sergeant Emery McDonald
Behave same as with the previous hunt, so get to the rooftop of one of highest buildings in the area in order to locate sergeant. He should patrol streets in the eastern part of the green zone and his approximate location is [935, 1345]. Make sure that sergeant is not observed by anyone and consume him (button B and button Y).
Getting inside the Blackwatch base
New objective: Go to base India Two One to destroy Blackwatch's tank
New objective: Consume the commander to gain access to base India Two One
You have to reach a base in location [910, 1267]. Make sure that you are disguised as a soldier or a scientist, because it is a best way to get inside the base. Locate the commander, remembering about avoiding viral detectors. Wait until the commander is not seen by anyone and consume him (button B and button Y).
New objective: Use the hand scanner to enter base India Two One
Go to the hand scanner in location [918, 1267] and interact with it to get inside the main base building.
New objective: Destroy the motorpool scheduled for upgrading
The important information is fact, that in order to complete the bonus objective, you have to use a tank to destroy at least one enemy machine. I strongly recommend this option. So take control over the single tank parked on the left side (by double clicking B button).
Aim at the one of the three tanks on the right and start shooting, using LB and RB buttons. After destroying first of them, you might of course attack other machines, ignoring a short cut-scene about Phase Two super soldier in the area among others.
If you were quick enough, you should have destroyed all three tanks, before yours was destroyed too. But if you didn't manage to do that, I suggest getting inside another tank. It is worth noting, that nothing bad will happen to you, if your tank explodes with you inside, so you can keep shooting until your machine is completely destroyed.
Defeating Blackwatch soldiers
New objective: Kill the Blackwatch troopers
First, I propose to focus on standard soldiers with rocket launchers, so they won't bother you later. You'll also regenerate your health bar and obtain mass needed to perform the Devastator attack.
Finally take care of the super soldier. As already mentioned, he is a Phase Two soldier, so do not try to use a rocket launcher against him, because you won't hurt him this way. Instead block his attacks (RB button) and grab him each time he got stunned (B button). Repeat these actions until he is almost dead, but if you loaded the mass bar, you can also perform the Devastator attack, which will inflict him some damage.
New objective: Exit base India Two One
Finish the fight with super soldier by consuming him. Now shapeshift into a soldier or scientist and only then go to the exit in location [930, 1265]. Once you get inside, move away from the base and the mission will be over soon. Notice, that as a reward for completing the mission, you can choose a mutation from Predator category.