Here is the full list of all 45 Clash of Cards achievements.
Unlock the 7th Arena
Complete 3 side quests
Create a legendary card
Reach the 12th level
Sell 300 creatures
500 evil cards
500 PvP wins
Sell 100 creatures
Sell 50 creatures
Summon 500 cards
Create a card
Unlock all skills of 2 warlords
Unlock all warlord’s skills
Sacrifice 300 cards
250 evil cards
Sacrifice 100 cards
Sacrifice 50 cards
500 righthouse cards
75 spells are collected
100 evil cards
Summon 200 cards
Unlock the 4th Arena
50 spells are collected
Create a rare card
Collect 25 000 golds
250 righthouse cards
100 PvP wins
Mission 20 is finished
100 epic+ cards are collected
Complete one challenge
75 epic+ cards are collected
Summon 50 cards
25 spells are collected
Unlock the 2nd Arena
100 righthouse cards
Reach the 8th level
Collect 5 000 golds
Mission 9 is finished
25 epic+ cards collected
10 PvP wins
Mission 7 is finished
Complete 5 events
Reach the 5th level
Collect 1000 golds
Unlock the second warlord