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