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