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