Here is the full list of all 64 Guardians of Hyelore achievements.
Slay 300 enemies.
Gain a victory in stage 1 with 3 stars.
Gain a victory without Argoth being defeated.
Gain a victory using only Warrior units.
Gain 10 stars.
Gain 20 stars.
Gain 50 stars.
Gain all stars.
Hire 150 Scouts.
Hire 150 Clerics.
Hire 150 Wardens.
Hire 150 Conjurers.
Deal at least 100 damage from a single arrow.
Gain a victory in under 1 minute.
Earn 1000 gold coins in a single battle.
Earn 10000 gold coins.
Defeat a boss in under 10 seconds.
Gain a victory without encountering a boss.
Shoot 1500 arrows.
Heal 300 times.
Gain a victory without spending more than 250 gold.
Gain 5000 health from heals.
Max out all of Argoth's abilities.
Gain 3 victories in a row without being defeated.
Obtain 25 achievements.
Gain a victory without taking any tower damage.
Cast 250 magic spells.
Land the finishing blow on a boss with a bomb.
Defeat 10 bosses.
Defeat 20 bosses.
Defeat 30 bosses.
Earn every achievement.
Gain 3 stars in 5 stages.
Gain 3 stars in 10 stages.
Gain 3 stars in 20 stages.
Gain 3 stars in 30 stages.
Gain a victory using only Support units.
Explore the Catacombs.
Accumulate 1000 gems.
Accumulate 5000 gems.
Accumulate 10000 gems.
Accumulate 20000 gems.
Accumulate 50000 gems.
Toss 75 bombs directly onto targets.
Use 3 potions in a single battle.
Use 6 potions in a single battle.
Consume 100 potions.
Consume 200 potions.
Consume 500 potions.
Obtain 50 achievements.
Gain 4 or more stars on your first attempt of stage 4.
Gain 4 or more stars on your first attempt of stage 7.
Gain 4 or more stars on your first attempt of stage 12.
Gain 4 or more stars on your first attempt of stage 17.
Gain 4 or more stars on your first attempt of stage 22.
Defeat the final stage on your first attempt.
Damage 500 enemies with Arctic Hail.
Wait for some time before hiring your first unit.
Defeat a stage without any casualties while being at most 2 levels higher than the enemy.
Knock back 30 enemies with one cyclone.
Stun 200 enemies.
Collect 250 gems from enemy drops.
Slay 200 enemies in a single battle.
Freeze 20 or more enemies with one Frigid Winds.