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