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