If you want to keep track of the species that you need for this achievement, without having to maintain a huge list (like I did on my playthrough), just aim for the Master Challenger achievement which will make you restore most but not all of Piñata.
The Piñata that are not included in any of the Challenges are:
Chewnicorn
Choclodocus
Dragonache
Flapyak
Red Flutterscotch
Blue Flutterscotch
Pink Flutterscotch
Black Flutterscotch
Brown Flutterscotch
Yellow Flutterscotch
White Flutterscotch
(List taken from
http://vivapinatawiki.com/viva/Langston%27s_Destination_Chal...)
Fill the candiosity meter of all the above Piñata (easier with a Joy candy or with a Choclodocus when you acquire it), send them to a party, play though the game and when you finish off all Langston's Challenges the Expert Records Keeper achievement will pop up along with other two (Region 7 Challenger achievement, Master Challenger).