Here is the full list of all 56 Dark Stone: The Lightseeker achievements.
Defeat the final boss.
Defeat the Goblin boss at the last stage.
Defeat the Golem boss at the last stage.
Defeat the Reptile boss at the last stage.
Defeat the Gambler boss at the last stage.
Defeat the Dwarf boss at the last stage.
Defeat the Robot boss at the last stage.
Defeat the Mushroom boss at the last stage.
Defeat the Orc boss at the last stage.
Defeat the Mermaid boss at the last stage.
Defeat the Angel boss at the last stage.
Defeat the Treant boss at the last stage.
Defeat the Skeleton boss at the last stage.
Victory by annihilating all enemies.
Victory without damage to the hero's Health.
Victory with no loss of allies.
Victory with fewer allies than enemies.
A Battle using 3 or less Mana in a single turn.
Collect 10+ gold.
Make one unit's health 30+.
Collect 20+ gold.
Collect 20+ items.
Recruit 30+ units.
Complete 5+ quests.
Collect 10+ units of the same race.
Victory without any items.
Victory by killing the enemy hero.
Skip rewards 5+ times.
Deal 20+ damage to a single enemy with a single strike.
Select 5 units for a single battle.
Collect 10+ units of level 3+
Use the reroll button 10+ times.
Victory by forming a team with Level 1 units only.
Finish a trip at level 1.
Finish a trip at level 5.
Finish a trip at level 10.
Finish a trip at level 15.
Finish a trip at level 20.
Accumulate Dark stone 10+
Accumulate Dark stone 20+
Accumulate Dark stone 50+
Accumulate Dark stone 100+
Accumulate Dark stone 200+
Accumulate Dark stone 500+
Accumulate Dark stone 1000+
Accumulate Dark stone 2000+
Accumulate Dark stone 5000+
Accumulate Dark stone 10000+
Unlock units 10+.
Unlock units 20+.
Unlock units 50+.
Unlock units 100+.
Accumulate coin 100+
Accumulate coin 200+
Accumulate coin 500+
Accumulate coin 1000+