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