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