Here is the full list of all 44 Chronicle: RuneScape Legends achievements.
Have at least 15 base attack in a game.
Have at least 10 base attack in a game.
Win any game with Morvran.
Get promoted to the gold league in ranked.
Open 50 booster packs.
Win 50 games in any mode.
Have a weapon with at least 10 attack.
Have a weapon with at least 8 durability.
Win a least 3 games in a single dungeoneering run.
Start a dungeoneering run.
Have at least 5 base attack in a game.
Have at least 30 gold in a game.
Win any game with Vanescula.
Win any game with The Raptor.
Win any game with Linza.
Win any game with Ozan.
Play 10 games in any mode.
Win any game with Ariane.
Draw at least 10 cards from effects in a game.
Have at least 10 armour in a game.
Complete the tutorial.
Build a custom deck.
Unlock all the Legends in the game.
Complete the bronze tier in solo.
Reach rank 1 in the ranked bronze league.
Open a booster pack.
Get promoted to the silver league in ranked.
Complete the silver tier in solo.
Build at least 3 custom decks.
Craft a card in the collection.
Gain rising star in ranked.
Complete an attack skilling challenge.
Complete a magic skilling challenge.
Complete a smithing skilling challenge.
Open 10 booster packs.
Complete the gold tier in solo.
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 a weapon with at least 20 attack.
Have at least 150 gold in a game.