Here is the full list of all 17 Of Tanks and Demons III achievements worth 1,000 gamerscore.
Purchased a THUNDER
Beated the final boss
Completed twelve levels
Completed ten levels
Killed 72 monsters
Used boost 60 times
Beated the second boss
Completed five levels
Purchased all upgrades for one tank
Beated the first boss
Purchased a RED SHADOW
Purchased a HELL BUSTER
Collected 150 photons
Yeah! Rock!
Collected 100 photons
Collected 50 photons
Purchased your first upgrade