I believe that you get a foal (any one) and then you put a put on at 10 months. Then you play with the horse to gain 20 gp.
You have to find a foal game schedule. If you are on International Howrse, there is one in Dr. Zig's forum.
What is the objective
You breed a unicorn. Period.
First, you need two foals. They do not have to be produced by you. Next, go to the shop and purchase any companion. They will all get you the same GP gain so it doesn't matter which you choose.
an apple someone sends to you for an objective
you have to congratulate someone on there birthday :)
100 droppings
Howrse has a page for people's birthdays. Click on one of them and then you click congratulate.
When you get to the objective that tells you to name your horse "Tip", then you will get a prize for completing the objective.
It doesn't mean anything really. It's just an objective Howrse makes you do.
To complete objective 20 you click your horses name and click rename then you call it Tip.
Profile > my account > invite friends From this page you can enter the email address of a friend and invite them to sign up to the Howrse game. If they complete registration then you pass this objective.