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