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