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