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