Here is the full list of all 33 Boo Bunny Plague achievements.
Beat the game on Impossible mode!
Collected All Audio Lore in one game.
Stun Thor 10 times with his own hammer.
Collected the Streetz guitar.
Hit the giant donut!
You collected all of the coins in the credits
Watched the entire after credits scene
Unlocked Impossible mode!
Defeated the Chairman
Defeated the Secretary
Defeated Heimdall
has defeated Thor, Garmr, Hel ,Tyr and Heimdall
Somehow managed to fall through the world and hit a kill zone
Defeated Death
Defeated all Four Horsemen of the Apocalypse
Defeated Famine
Defeated War
Defeated Pestilence
Collected the Electric guitar.
Defeated Tyr
Collected the Frankenstrat.
Defeated Hel
Burn enemies 50 times.
Collected the Ice guitar.
Bounced on vikings 50 times
Defeated Garmr
Triggered Faye's transformation
Defeated Thor
Collected the Fire guitar.
Used Gunny to defeat an enemy.
Collected the "Useless" Acoustic
Defeated TRex
Destroyed all of the Bunny's in the factory