Full list of all 15 Drone Gladiator (Windows) achievements worth 2,000 gamerscore.
The base game contains 10 achievements worth 1,000 Gamerscore, and there is 1 DLC pack containing 5 achievements worth 1,000 Gamerscore.
Destroy 10 enemies
Destroy 100 enemies
Survive 10 waves
Defeat the Treader
Survive random event.
Destroy 5 enemies with a sword
Destroy 50 enemies
Jump out of the platform into the water
Survive 40 waves in total
Destroy 25 enemies with any gun
Take the first boots
Destroy 10 enemies with hammer
Make a first purchase
Destroy 10 enemies with rockets
Destroy 10 teleporters