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