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