Here is the full list of all 44 Chronicle: RuneScape Legends achievements.
Have at least 10 base attack in a game.
Have a weapon with at least 20 attack.
Open 50 booster packs.
Draw at least 10 cards from effects in a game.
Win 50 games in any mode.
Win any game with Morvran.
Have a weapon with at least 20 durability.
Open 10 booster packs.
Get promoted to the silver league in ranked.
Reach rank 1 in the ranked bronze league.
Gain rising star in ranked.
Complete the gold tier in solo.
Build at least 3 custom decks.
Start a dungeoneering run.
Complete an attack skilling challenge.
Complete the silver tier in solo.
Craft a card in the collection.
Win any game with Ozan.
Complete a magic skilling challenge.
Open a booster pack.
Win any game with Vanescula.
Play 10 games in any mode.
Complete a smithing skilling challenge.
Complete the bronze tier in solo.
Have a weapon with at least 8 durability.
Build a custom deck.
Unlock all the Legends in the game.
Win any game with Linza.
Have a weapon with at least 10 attack.
Win any game with Ariane.
Win any game with The Raptor.
Have at least 5 base attack in a game.
Have at least 10 armour in a game.
Complete the tutorial.
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 at least 15 base attack in a game.
Have at least 150 gold in a game.