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