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