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