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