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