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