Here is the full list of all 27 Super Sanctum TD achievements.
Kill the Charger and all its clones.
Unlock all towers and skills.
Kill a Walker with an Anti Air Tower.
Clear the Hydro Islands.
Unlock all tower and skill slots.
Kill a Big Walker.
Hit 10 enemies with Thunderbolt.
Complete a level without using any skills.
Have no blocks at the end of a level.
Kill 10 enemies with a single shot
Beat a wave with only skills and blocks.
Get 100 perfect rounds.
Clear the Facility Compound
Clear the Training Area.
Beat a level on Hard.
Complete one level.
Kill 2 enemies with a single Bomb.
Kill 10 enemies in a single Penentrator shot.
Clear Brightholme Industries.
Kill a Huge Walker.
Beat all levels on Normal.
Kill the Patriarch.
Beat all levels on Hard.
Kill the golden Walker.
Get all stars in all levels on Hard difficulty.
Kill 10.000 Walkers.
Clear Elysion