No missable achievements (plus 33 unknown)
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Collected the "Useless" Acoustic
Used Gunny to defeat an enemy.
Collected the Fire guitar.
Collected the Ice guitar.
Collected the Electric guitar.
Defeated all Four Horsemen of the Apocalypse
has defeated Thor, Garmr, Hel ,Tyr and Heimdall
Defeated the Secretary
Defeated the Chairman
Unlocked Impossible mode!
Burn enemies 50 times.
Hit the giant donut!
Bounced on vikings 50 times
Stun Thor 10 times with his own hammer.
Collected All Audio Lore in one game.
Beat the game on Impossible mode!