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