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