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