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