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