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