This will help 100% the game.
During Gameplay
Good Egg
Helped Cerys.
As soon as you get access to the elevator, make a pit stop at IT and assist the woman who dropped her badge.
Gotta Go
Tried to use the bathroom.
When you reach your apartment, repeatedly try to use the restroom.
Cute
Acted cute with Frank.
When you are forcibly given a car ride to meet Frank, tell him that he is under arrest.
Endings
Finished the game for the first time, yay!
Earned at the end, regardless of which ending you pick.
Commentary
Completed the game with the commentary on.
Set commentary mode on before beginning the game and leave it on the whole time.
NOTE: For the four endings below, save your game directly after the part where your screen goes black and you climb out of an overturned car.
Coward
Grab the gun from the overturned car and then exit the screen in the direction that the car came from.
First Kill
Grab the gun from the overturned car and then continue down the road to the facility. When there is a tense standoff, shoot the man on the left.
Betrayal
Grab the gun from the overturned car and then continue down the road to the facility. When there is a tense standoff, shoot the man on the right.
Sensible
Grab the gun from the overturned car and then continue down the road to the facility. When there is a tense standoff, select the floor to lower your weapon.