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