Here is the full list of all 27 Super Sanctum TD achievements.
Kill 10.000 Walkers.
Get all stars in all levels on Hard difficulty.
Beat all levels on Hard.
Clear Elysion
Beat all levels on Normal.
Kill the Patriarch.
Clear Brightholme Industries.
Kill a Huge Walker.
Kill 10 enemies in a single Penentrator shot.
Unlock all towers and skills.
Kill a Walker with an Anti Air Tower.
Kill the Charger and all its clones.
Beat a level on Hard.
Clear the Hydro Islands.
Get 100 perfect rounds.
Unlock all tower and skill slots.
Hit 10 enemies with Thunderbolt.
Kill a Big Walker.
Clear the Facility Compound
Have no blocks at the end of a level.
Kill the golden Walker.
Beat a wave with only skills and blocks.
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.