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