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.
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.
Unlock all towers and skills.
Kill 10 enemies in a single Penentrator shot.
Hit 10 enemies with Thunderbolt.
Kill a Walker with an Anti Air Tower.
Clear the Hydro Islands.
Unlock all tower and skill slots.
Get 100 perfect rounds.
Beat a level on Hard.
Have no blocks at the end of a level.
Kill 10 enemies with a single shot
Kill a Big Walker.
Clear the Facility Compound
Complete a level without using any skills.
Clear the Training Area.
Beat a wave with only skills and blocks.
Kill 2 enemies with a single Bomb.
Complete one level.