This is the first story achievement in the game where you have to do good deeds to get coins to buy your sister a present.
*** Spoiler - click to reveal ***For this you have to do 3 tasks 2 of them you can do bad deeds.
1. There is a man behind the second house on the right from yours before you go down the path. He is talking to a girl and you can either tell his wife for good karma or he will pay you a gold coin for bad karma. If you tell his wife she is located in the town square behind the tree you will see her when she turns green to talk.
2. There is a little girl in the town square and she lost her teddy bear. For this you have to walk down a ways to two kids in a fight. Talk to the little kid first and he will say that the other one is going to beat him up and if you were to fight him he would leave him alone. Talk to the other kid and then lock onto him with LT then punch him with X till the meter is gone. Then talk to the little girl again.
3. Last is man who has to go to the bathroom and asks you to stand in the middle of the boxes and watch them. Just stand there so the timer is green and counts down, there will be a little girl there that tries to talk you into smashing the boxes, but as long as you stand there you will be fine.
After all that go to your dad and he will give you coins to go to the trader in the town square to buy some chocolates for your sister then turn around and walk straight to find your sister in a field with a scarecrow. After the cut scene walk back to your dad and the achievement will pop. Don't forget to kick a chicken or two for fun!