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