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