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