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
Reach Knowledge Level 100.
Reach Knowledge Level 75.
Acquire 1000 Legendary Items.
Reach Level 300
Rebirth 7 times.
Enter 100 Dungeons.
Reach Knowledge Level 50.
Reach Level 200
Reach Knowledge Level 30.
Enter 25 Dungeons.
Use 500 Books.
Enter 10 Dungeons.
Reach Knowledge Level 15.
Gain 500 Equipment.
Rebirth 3 times.
Acquire 100 Legendary Items.
Enter a Dungeon.
Destroy 10000 Targets.
Reach Knowledge Level 5.
Use 100 Books.
Use 1000 Potions.
Destroy 5000 Targets.
Rebirth 1 time.
Gain 100 Equipment.
Use 25 Books.
Use 500 Potions.
Reach Level 100
Destroy 2000 Targets.
Acquire 10 Legendary Items.
Reach Level 75
Destroy 1000 Targets.
Gain 25 Equipment.
Reach Level 50
Use a Book.
Acquire a Legendary Item.
Destroy 500 Targets.
Use 100 Potions.
Reach Level 20
Destroy 100 Targets.
Gain an Equipment.
Use 25 Potions.
Reach Level 5
Use a Potion.