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