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