Here is the full list of all 16 Prototype Mansion - there are Used No Cover achievements.
Took the easy way out.
Achieved S-Rank when completing the game.
All weapons & upgrades.
No damage taken.
Become the master of unlocking.
Remembered why nobody uses tank controls anymore.
Read a lot of documents.
Every kitty was saved.
Shot all the kitties.
Killed by clone zombie.
Defeated the final boss.
Beat the game.
Beat the game on hard mode.
Killed Hank in overtime mode.
No zombies were harmed in the making of this achievement.
Killed all bugs with pesticide.