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