Here is the full list of all 12 Palworld achievements. It takes around 80-100 hours to unlock all of the achievements on Windows.
Caught 50 kinds of Pals
Caught 90 kinds of Pals
Caught 20 kinds of Pals
Caught 10 kinds of Pals
Defeated Victor & Shadowbeak
Defeated Lily & Lyleen
Defeated Axel & Orserk
Defeated Marcus & Faleris
Caught first Pal
Defeated Zoe & Grizzbolt