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