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