Yes, the achievement dragon you want is the dragon of ICC, a 25-person hero, which needs two CDs to complete. There are CDs that have been bitten by the queen and CDs that have not been bitten. Look at your grades and see if you have been bitten. The next time I went to play, the head of Team M said that the Queen would be bitten (or not). It seems that the required grade is one for each boss. There are some achievements in this achievement, so you can go and have a look for yourself. Now it's level 90, there's basically nothing to pay attention to, just listen to the leader. The dragon of 25 people is frost dragon, and the white dragon you see makes the young white dragon reward 50 mounts. 10 people's color is lighter than 25 people's black.
I will send you the achievements you want:
Hero: Attack the Iceberg Fortress (25 people)
Hero: Natural Disaster Factory (25 people)
Hero: Bloody Hall (25 people)
Hero: Shuang Huatang (25 people)
Bone penetration
Enjoy a happy party.
I got on the boat.
Ah, that's terrible.
Dance with the soft mud
Ventilation frequently and drink plenty of water.
Nausea, heartburn, indigestion ...
Sphere whisperer
Once bitten, twice shy.
door-god
limit
Liberate yourself
Fall into evil
That's basically it.