You already hand out achievement awards for players who win contests, why not ones for just participation?
What about pets who have different colored dominant and recessive gene colors instead of all, "210 pets"
It would be a lot easier to collect all the pet colors with one pet that has Black Dominant and Blue Recessive instead of one pet of each color.
210 pets ÷ each pet with 2 colors = 105 pets.
Or how about easier unlockable achievements? Collect them-all may be frustration to some players, however, mixing them with Collect-some may be more fun.
Why not try making a collecting task a little easier?
Ex:
Basic Achievement:
Collect X species from the class of Bird to unlock basic bird achievement.
Intermediate Achievement:
Now that we've completed the first checklist, it looks like you found out there's still more to do than collect X species, however, collecting is accumulative... If you already collected, do not fret my friend! You will not need to re-collect them. Now, on to your next task at hand....
Collect at least 50% of the species from a class of bird to unlock Super Bird achievement that transforms your basic bird into a an eagle.
Advanced Achievement:
Congrats on your super bird! Now Collect the remaining 50% the current species of a class of Bird, to unlock and transform that super bird into Descendant of Heroes Bird achievement.
Bonus Achievement:
For completing all the advanced achievements in the achievement category "Class", you will recieve the "World Class" achievement with an added bonus of x% increased energy for one week as an added thank you for all your hard work.
“Obstacles are only obstacles if you see them as obstacles. They can also be called opportunities.”
-Tucker Max