Here is the full list of all 48 Remaya Idle achievements.
Rebirth 50 times.
Rebirth 30 times.
Rebirth 15 times.
Reach Level 500
Reach Level 400
Rebirth 7 times.
Reach Knowledge Level 100.
Reach Knowledge Level 75.
Reach Level 300
Reach Knowledge Level 50.
Rebirth 3 times.
Acquire 1000 Legendary Items.
Use 500 Books.
Reach Knowledge Level 30.
Reach Level 200
Enter 100 Dungeons.
Reach Knowledge Level 15.
Gain 500 Equipment.
Enter 25 Dungeons.
Rebirth 1 time.
Enter 10 Dungeons.
Acquire 100 Legendary Items.
Enter a Dungeon.
Reach Knowledge Level 5.
Use 100 Books.
Destroy 10000 Targets.
Use 1000 Potions.
Reach Level 100
Destroy 5000 Targets.
Gain 100 Equipment.
Use 500 Potions.
Acquire 10 Legendary Items.
Use 25 Books.
Destroy 2000 Targets.
Reach Level 75
Destroy 1000 Targets.
Gain 25 Equipment.
Reach Level 50
Acquire a Legendary Item.
Use a Book.
Use 100 Potions.
Destroy 500 Targets.
Reach Level 20
Gain an Equipment.
Use 25 Potions.
Destroy 100 Targets.
Reach Level 5
Use a Potion.