Here is the full list of all 50 Epic Cards Battle(TCG) achievements.
Possess 50 distinct cards
Complete a daily mission
Win a Ladder battle
Watch a live battle between other players
Win a battles in global match
Enhance a card to level 10
Achieved 100 stars in campaign
Reach Level 15
Complete all lessons in academy
Possess 20 distinct cards
Reach Level 10
Complete a Boss campaign quest
Possess 10 distinct cards
Reach Level 5
Buy any item in shop
Complete a campaign quest in Hard difficulty
Win a battle in campaign
Send a chat message
Complete all campaign quests in Hard difficulty
Win 20 battles in global match
Win 100 battles in global match
Win 250 battles in global match
Win 500 battles in global match
Win 5 battles in quick mode
Win 5 battles in pro mode
Win 5 battles in hardcore mode
Possess 100 distinct cards
Reach 5% of enhancing rate
Reach 15% of enhancing rate
Reach 30% of enhancing rate
Add a friend
Join a guild
Evolve a card
Unlocks 50 arts in gallery
Reach Level 20
Reach Level 25
Reach Level 30
Reach Level 35
Reach Level 40
Reach Level 45
Reach Level 50
Reach Level 55
Reach Level 60
Reach Level 65
Reach Level 70
Craft a new card successfully
Watch a battle replay of your own
Win a global match under condition "Extinction"
Win a global match under condition "Time Out"
Ranked in Ladder TOP 100 and get rewards