Here is the full list of all 67 Crystal Maidens achievements.
Play 15 days in a row
Lose 100 battles
Upgrade 1 legendary item to the level 5
Upgrade 1 epic item to the level 5
Play 500 battles with Marksman class
Play 500 battles with Engineer class
Romance 15 maidens to level 3
Play 500 battles with Mage class
Play 500 battles with Support class
Upgrade 30 rare items to the level 5
Earn 1 million coins in Campaign Mode
Play 100 battles with Engineer class
Play 100 battles with Marksman class
Play 50 battles with Marksman class
Play 50 battles with Engineer class
Earn 180 stars in Campaign 1
Upgrade 10 rare items to the level 5
Lose 50 battles
Play 7 days in a row
Get a hero up to level 60
Upgrade a skill to the level 20
Play 100 battles with Warrior class
Upgrade a building up to level 5
Earn 250.000 coins in Campaign Mode
Upgrade 30 common items to the level 5
Upgrade 10 common items to the level 5
Upgrade 1 rare item to the level 5
Kill 1000 enemies in battle
Upgrade 1 common item to the level 5
Find a legendary item in the Campaign Mode
Complete level 60 of Campaign Mode
Play 100 battles with Support class
Play 100 battles with Mage class
Romance 5 maidens to level 3
Win 50 battles with all 3 stars
Get a hero up to level 30
Play 50 battles with Support class
Earn 120 stars in Campaign 1
Play 50 battles with Mage class
Kill 250 enemies in battle
Complete level 30 of Campaign Mode
Win 20 battles with all 3 stars
Own 15 maidens
Own 10 maidens
Play 50 battles with Warrior class
Earn 60 stars in Campaign 1
Kill 100 enemies in battle
Upgrade a skill to the level 5
Earn 5000 coins in Campaign Mode
Get a hero up to level 10
Upgrade a building up to level 2
Win 5 battles with all 3 stars
Complete 10 quests
Complete 50 quests
Complete 200 quests
Romance 2 maidens to level 3
Own 5 maidens
Complete level 1 of Campaign Mode
Upgrade a building up to level 10
Upgrade 10 epic items to the level 5
Upgrade 30 epic items to the level 5
Lose 500 battles
Find 5 legendary items in the Campaign Mode
Find 10 legendary items in the Campaign Mode
Upgrade 10 legendary items to the level 5"
Upgrade 30 legendary items to the level 5