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