Here is the full list of all 10 Last Mage Standing achievements.
Kill 100 enemies.
Kill 40 enemies with melee weapons.
Kill 20 enemies without being damaged.
Kill 20 enemies with melee weapons.
Create 10 big fireballs.
Kill 10 enemies.
Kill 1000 enemies.
Kill 10000 enemies.
Kill 100 enemies with melee weapons.
Survive for 10 minutes.