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