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