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