Here is the full list of all 30 Dolmen achievements.
Kill the Ferronightmare
Kill a Zimodonte
Craft any Boss special weapon
Kill the Queen Caniptei and finish the first Act
Respawn any Boss
Kill the Twin Ancients
Kill a veteran enemy
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
Level up for the first time
Access the spaceship for the first time
Parry a melee attack
Heal by using energy
Activate the energy mode for the first time
Find your first rare craft material
Kill an enemy
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 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