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