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