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