Here is the full list of all 44 Chronicle: RuneScape Legends achievements.
Have a weapon with at least 8 durability.
Get promoted to the gold league in ranked.
Complete the gold tier in solo.
Get promoted to the silver league in ranked.
Reach rank 1 in the ranked bronze league.
Gain rising star in ranked.
Win 50 games in any mode.
Win any game with The Raptor.
Open 10 booster packs.
Win any game with Morvran.
Win any game with Ozan.
Win any game with Linza.
Have a weapon with at least 10 attack.
Win any game with Vanescula.
Have at least 5 base attack in a game.
Build at least 3 custom decks.
Craft a card in the collection.
Win a least 3 games in a single dungeoneering run.
Complete a smithing skilling challenge.
Start a dungeoneering run.
Have at least 10 armour in a game.
Complete the silver tier in solo.
Complete a magic skilling challenge.
Complete an attack skilling challenge.
Play 10 games in any mode.
Draw at least 10 cards from effects in a game.
Build a custom deck.
Open a booster pack.
Unlock all the Legends in the game.
Complete the bronze tier in solo.
Win any game with Ariane.
Complete the tutorial.
Have at least 30 gold in a game.
Have at least 10 base attack in a game.
Complete an entire dungeoneering run.
Win 500 games in any mode.
Get every legend to at least level 25.
Get promoted to the diamond league in ranked.
Have at least 75 armour in a game.
Have a weapon with at least 20 durability.
Have a weapon with at least 20 attack.
Have at least 15 base attack in a game.
Have at least 150 gold in a game.
Open 50 booster packs.