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