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