Here is the full list of all 18 Hell Architect achievements.
Complete all stages of the Tutorial.
Complete the Prologue.
Complete the "Issues With Lights" scenario.
Complete the "Unstable Crystals" scenario.
Complete the "Pink Hell" scenario.
Complete the "Surprise from Heaven" scenario.
Complete the "Between The Devil & The Deep Blue Sea" scenario.
Complete the "Battle Royale" scenario.
Collect 666 units of Suffering overall.
Complete research on all structures.
Have everything built from each category of the Build menu in Sandbox mode, in a single playthrough.
Collect 100000 units of Dirt overall.
Collect 5000 units of Metal overall.
Collect 5000 units of Coal overall.
Collect 2000 Yellow Crystals overall.
Collect 2000 Blue Crystals overall.
Collect 2000 units of Essence overall.
Collect 500000 Sufffering overall.