Not sure if exploit or not, if not, just move it to Guides section please.
So, if like me, you've collected most Battle Pets but haven't done the achievements below(to /hug certain types of critters), you might be thinking that to do them you will have to look for them again.
Actually it seems that if you captured those critters, if you summon them and use the emote on them, it will still count for the achievement.
I haven't tried this, but it might work with other friends' battle pets, which could be a cool and different way of earning gold by selling the achievements.
Here are the achievements:
To All The Squirrels I've Loved Before - Achievement - World of Warcraft
To All The Squirrels Who Shared My Life - Achievement - World of Warcraft
To All the Squirrels Who Cared for Me - Achievement - World of Warcraft
To All the Squirrels I Once Caressed? - Achievement - World of Warcraft