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