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