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