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