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