Here is the full list of all 69 SCUM achievements.
The base game contains 54 achievements, and there are 2 DLC packs containing 15 achievements.
Get 200 melee kills
Win your first event
Get 100 firearm kills
Survive for 4 days on the island
Kill 100 Puppets
Kill a player.
Reach 400+ fame points.
Reach 300+ fame points.
Kill your first animal.
Reach 200+ fame points.
Get 10 melee kills
Reach 100+ fame points.
Light your first fire.
Craft an improvised knife
Craft a clothing item.
Kill a puppet.
Spawn on the island for the first time.
Kill 10 players.
Kill 100 Players
Kill 500 Players
Kill 1,000 Players
Kill 5,000 Players
Kill 1,000 Puppets
Kill 10,000 Puppets
Kill 20,000 Puppets
Reach 500+ fame points.
Reach 600+ fame points.
Reach 700+ fame points.
Reach 800+ fame points.
Reach 900+ fame points.
Get 3,000 melee kills
Get 2,000 firearm kills
Get 30,000 firearm kills
Win 50 events
Win 100 events
Survive for 16 days on the island
Survive for 24 days on the island
Survive for 32 days on the island