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