Here is the full list of all 30 Dolmen achievements.
Kill the Queen Caniptei and finish the first Act
Kill the Twin Ancients
Respawn any Boss
Kill the Dementula Boss
Find a hidden Driller
Find 5 hidden Drillers
Find all hidden Drillers
Parry and reflect a ranged attack
Level up for the first time
Access the spaceship for the first time
Kill a veteran enemy
Activate the energy mode for the first time
Find your first epic craft material
Find your first rare craft material
Parry a melee attack
Kill an enemy
Heal by using energy
Craft all kinds of melee weapons
Craft all kinds of ranged weapons
Craft all kinds of armors
Reach Vahani Excavations
Reach the Secret Grove
Kill the Ferronightmare
Kill the Corrupted Dementula
Kill Zallan Kheep and finish the second Act
Kill the Boss Lobodja
Defeat General Vesib
Defeat the Boss Tharvus Kheep and finish the game
Kill a Zimodonte
Craft any Boss special weapon