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