Watch each comic without skipping.
Finish a chase level with at least 75% of the Ecto-shield up.
Play with each character.
Unlock every level and defeat the final boss.
Get 100% score with the trap.
Find all the collectibles hidden inside objects in each level.
Kill a Slime Abomination with the wrong weapon.
Defeat the Subway Smasher.
Revive any teammate 20 times.
Finish an online level with the help of 3 other players.
Finish the first level.
Destroy all the expensive LCD televisions in the hotel.
