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