Here is the full list of all 8 Thin Judgment achievements.
Reach a perfect score of 100% in Happiness and Productivity.
Burn multiple paper people at once using gasoline.
Let all of the paper people burn in the furnace for one round.
Smoke a blunt while a paper person is looking at you.
Collect your first paper person.
Collect 10 paper people.
Collect 100 paper people.
Collect 1000 paper people.