Here is the full list of all 22 Realm Royale Reforged achievements.
Get 50 eliminations as an Assassin.
Get 50 eliminations as a Warrior.
Get 50 eliminations as a Hunter.
Eliminate an enemy player as a Hunter.
Win a match as a team of 4 without losing a single player.
Eliminate an enemy player as an Engineer.
Get 50 eliminations as an Engineer.
Get a Crown Royales with 3 different classes.
Eliminate more than 10 players in a single match.
Eliminate an enemy player as an Assassin.
Get a Legendary Item in every slot.
Eliminate an enemy player as a Warrior.
Eliminate an enemy player with your dagger.
Chicken a player from more than 800 feet away.
Forge 100 Items.
Get 50 eliminations as a Mage.
Get 10 Crown Royales.
Forge your first Legendary Weapon.
Loot Armor Potions 20 times.
Get a Crown Royale.
Survive after becoming a chicken.
Eliminate an enemy player as a Mage.