Here is the full list of all 50 Divinity II: The Dragon Knight Saga achievements worth 1,000 gamerscore.
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HowTo String for achievement 20
Kill Casper.
Kill the Killer Bunny.
Scare away the fortune teller.
Destroy all of Damian's Flying Fortresses.
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Bring to justice all of Rivellon's most wanted criminals.
Find Adah and Mahalath's secret cave.
Cure blindness.
Upgrade all your Battle Tower platforms to their maximal potential.
Send one of your runners on a mission.
Read someone's mind.
Summon your creature.
Level up once.
Charm an item.
Enchant an item.
Create a Potion.
Make use of your skills trainer.
Trade with someone.
Morph into a Dragon.
Make use of an illusionist's services.
Use the Dragon Stone.
Give Valeri the rarest of runes.
Make Anne's father proud.
Collect all the parts of an armor set.
Salvage ring, letters, and regurgitating toddler.
HowTo String for achievement 16