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