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