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