Here is the full list of all 31 Magicka: Wizards of the Square Tablet achievements.
Let a Seagal die from Oil.
Gib three enemies in one second.
Blow yourself up with a regular self-targeted spell.
Get killed by your own staff.
Imbue a personal barrier with three different elements.
Win a stage without ever using the Life element.
Purchase a familiar.
Win a stage by blowing every single enemy to bits.
Defeat Grampa the Gray.
Cast Supernova.
Defeat Helsdottir.
Suffer at least 5000 damage in one blow.
Defeat the Dark Young.
Defeat Disa.
Get decapitated.
Die from a stage hazard.
Defeat the Elk Dragon.
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Multiplayer: Telefrag a fellow wizard.
Defeat the Big Friendly Crab.
Suffer at least 1000 damage in one blow.
Multiplayer: Deal at least 800 damage to a fellow wizard in one attack.
Multiplayer: Die at least twice as often as all your teammates combined.
Explode so hard that your staff makes 3 full rotations before landing.
Suffer at least 500 damage in one blow.
Get blown to bits and have your staff get stuck in the ground pole-first.
Kill a Land Shark with a Thunder bolt.
Multiplayer: Have a team of four wizards all die.
Multiplayer: Have the yellow wizard die first in a stage's very first encounter.
Multiplayer: Have the green wizard never die or cast a single spell and still win the stage.
Multiplayer: Kill a fellow wizard.