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