Here is the full list of all 69 Wrack achievements.
Complete episode 1 on "Medium" or higher.
Earn a tyderium medal on any level.
Earn a platinum medal on any level.
Kill an idle kamikaze using the crusher's counterattack.
Gib every single enemy on any level.
Survive a bazooka jump with the bazooka's level 4 finisher AND the doomsphere.
Kill a full-health crusher with the shotgun's finisher.
Kill 10 or more monsters with the Pulsar's finisher.
Reset your kill chain timer by gibbing a corpse right before it expires.
Defeat Galactron.
Defeat Oculus.
Survive a bazooka jump without the Blast Guard.
Complete a map in Time Attack mode.
Defeat Gnash.
Obtain a jackpot.
Defeat Mechron.
Kill a monster with the Hyperblade finisher's slash and another with its projectile.
Gib 4 or more monsters in a single combo using a toxic barrel.
Complete a level using only the Hyperblade.
Find a BIG secret!
Earn a gold medal on any level.
Kill Geizer with a single shot.
End a kill chain with a level 4 finisher.
Poor kitty! :(
Beat your previous high score on any map.
Kill two or more Arcturan soldiers with the pistol's finisher.
Complete E1L1 with the minimum amount of kills possible.
Start the game using a code to give you 30 lives.
Slice up a monster that didn't see you coming!
Complete a map you've subscribed to through Steam Workshop.
Complete a map in Score Attack mode.
Gib 6 or more monsters in a single kill combo.
Survive a bazooka jump with the Blast Guard.
Kill a kamikaze using the Hyperblade without taking damage.
Earn a kill chain of 69x.
End a kill chain with a finisher.
Raise both your health and armor to 250.
Increase both your max. health and armor by 50.
Earn a kill chain of 40x or more.
Earn a kill combo of 6x or more.
Earn a kill combo of 8x or more.
Earn a kill chain of 25x or more.
Earn a kill combo of 4x or more.
Gib 4 or more monsters in a single kill combo.
Share a Wrack creation of yours through Steam Workshop.
Watch a replay off of the leaderboard.
View an item in the gallery.
Defeat Geizer.
Earn a kill chain of 16x or more.
Reset your kill chain timer by gibbing a corpse.
Increase either your max. health or max. armor.
Earn a kill chain of 3x on sentries using the pistol.
Earn a kill chain of 4x or more.
Have two Arcturans kill each other via infighting.
Earn a kill combo of 2x or more.
Gib 2 or more monsters in a single kill combo.
Defeat Giggordo and rescue Starlyn (episode 1).
Earn a gold medal on every level (episode 1).
Earn a platinum medal on every level (episode 1).
Earn a tyderium medal on every level (episode 1).
Complete episode 1 with a score of 5,000,000 or higher.
Complete episode 1 in 60 minutes or less.
Complete episode 1 without using a continue.
Complete episode 1 on "Hardcore" or higher.
Complete episode 1 on "Bullshit!".
Discover the Power Core.
Complete episode 1 having killed all of the monsters.
Complete episode 1 having collected all of the treasure.
Complete episode 1 having found all of the secrets.