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