Here is the full list of all 44 Chronicle: RuneScape Legends achievements.
Have a weapon with at least 20 attack.
Start a dungeoneering run.
Get promoted to the gold league in ranked.
Have a weapon with at least 8 durability.
Get promoted to the silver league in ranked.
Reach rank 1 in the ranked bronze league.
Gain rising star in ranked.
Win 50 games in any mode.
Complete a magic skilling challenge.
Complete a smithing skilling challenge.
Draw at least 10 cards from effects in a game.
Win any game with Vanescula.
Complete an attack skilling challenge.
Win any game with Morvran.
Have at least 10 base attack in a game.
Win any game with Ozan.
Complete the gold tier in solo.
Build at least 3 custom decks.
Craft a card in the collection.
Complete the silver tier in solo.
Play 10 games in any mode.
Win any game with Linza.
Complete the bronze tier in solo.
Have a weapon with at least 10 attack.
Win any game with Ariane.
Unlock all the Legends in the game.
Win any game with The Raptor.
Have at least 5 base attack in a game.
Have at least 10 armour in a game.
Build a custom deck.
Open 50 booster packs.
Open 10 booster packs.
Open a booster pack.
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 diamond league in ranked.
Have at least 75 armour in a game.
Have a weapon with at least 20 durability.
Have at least 15 base attack in a game.
Have at least 150 gold in a game.