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