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