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