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