Here is the full list of all 38 Flintlock: The Siege of Dawn achievements worth 1,000 gamerscore.
Defeat Rammuha.
Defeat Dukmar.
Defeat Inaya.
Defeat Uru.
Find all three pieces of a single armor set.
Complete the Cerith family saga.
Kill 20 enemies with a headshot.
Apply three different curses onto a single enemy at the same time.
Purchase a skill from the top row of the skill tree.
Activate 20 skulls.
Activate 50 skulls.
Defeat all Revenants.
Free all Hamlets.
Defeat all Bandit leaders.
Fully upgrade your Campsite.
Defeat the dark version of you.
Maintain Rift travel without entering a rift for 60 secs.
Kill five enemies within two seconds.
Find all Enki feathers.
Deflect ten bullets back at enemies.
Shoot your gun in a coffee shop.
Win three games of Sebo in a row against different opponents.
Die ten times.
Find all Shrines of Inaya.
Fully upgrade a sharp melee weapon.
Fully upgrade a blunt melee weapon.
Collect all firearms.
Fully upgrade a primary firearm.
Fully upgrade a helmet.
Fully upgrade one of your grenades.
Slide down a hill for 5 seconds.
Shoot down all enemy banners.
With a single claim convert at least 1,000 battle experience into Reputation.
With a single claim convert at least 15,000 battle experience into Reputation.
With a single claim convert at least 50,000 battle experience into Reputation.
Fully upgrade a secondary firearm.
Change your trousers and jacket.
Complete all side quests.