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