Full list of all 15 Risk of Rain achievements worth 1,000 gamerscore. It takes around 6-8 hours to unlock all of the achievements on Xbox One.
Defeat 20 lemurians in one playthrough.
Survive 40 minutes.
Die 50 times.
Kill a boss with "Lights Out."
Kill the Magma Worm, Wandering Vagrant, and Colossus.
Fail a shrine 3 times in a row.
Pass a shrine 4 times in a row.
Find the bloated survivor.
Find the robot janitor.
Collect 15 Monster Logs.
Bank 20,000 gold.
Unlock a golden chest with the Explorer's Key.
Collect 4 Keycards.
Drown 20 Whorls.
Deal 5000 damage in one shot.