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