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