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