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.
Acquire 1000 Legendary Items.
Reach Level 300
Reach Knowledge Level 75.
Enter 100 Dungeons.
Reach Knowledge Level 50.
Reach Level 200
Reach Knowledge Level 30.
Enter 25 Dungeons.
Rebirth 7 times.
Gain 500 Equipment.
Reach Knowledge Level 15.
Enter 10 Dungeons.
Enter a Dungeon.
Use 500 Books.
Destroy 10000 Targets.
Reach Knowledge Level 5.
Acquire 100 Legendary Items.
Use 100 Books.
Destroy 5000 Targets.
Rebirth 3 times.
Use 25 Books.
Use 1000 Potions.
Gain 100 Equipment.
Rebirth 1 time.
Reach Level 100
Destroy 2000 Targets.
Use 500 Potions.
Acquire 10 Legendary Items.
Reach Level 75
Acquire a Legendary Item.
Reach Level 50
Use a Book.
Gain 25 Equipment.
Use 100 Potions.
Destroy 1000 Targets.
Destroy 500 Targets.
Use 25 Potions.
Reach Level 20
Destroy 100 Targets.
Gain an Equipment.
Reach Level 5
Use a Potion.