Here is the full list of all 13 Respawn Man achievements.
Die 1000 times.
Publish your first level on the Steam Workshop.
Beat the postgame levels.
Beat the end boss with fewer than 6 of your corpses shambling about.
Why won't they stay down?
Reach the end Boss.
Her voyage couldn't even last 10 seconds.
Beat another player's Steam Workshop Level.
Fall onto the flag at termnial velocity with no lives to spare.
Complete the Day segment of the game.
Fall from a high height into water while also dying of poison.
Complete the Dawn segment of the game.
Completed a level without dying. No corpses.