I hope you enjoy this guide that I have created, I included the pictures of the achievements and also screenshots of where you should go to take the picture and get the achievement.

This guide was made from various internet sources, I would like to give credit to:
https://truesteamachievements.com/
https://www.xboxachievements.com/
https://astats.astats.nl
https://completionist.me/

And thanks to the community who inspired me to make this guide.

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Take a Break
You took a break from adventuring.

•  At the very beginning of the game, as you're carting the father to the doctor, stop immediately before the bridge and instead travel south on some stone steps. Run along the beach until you find a pile of rocks in front of the water. Interact with them as the little brother to begin skipping stones which will unlock the first Achievement.

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Wishing Well
You threw someone's ball down a well… Shame on you.

• At the start of Chapter 1, you can see a well off to the right and a girl playing with her ball in the distance. Go take her ball and throw it down that well 

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Love Birds - Step One
You re-united the two love birds.

• This is a two-parter. In Chapter 1, right before the wheel that leads to the sheep, there's a bird cage that needs to be opened. 

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Black Sheep
Every family's got one.

•  In Chapter 1, you'll come across a wheel that needs to be run on in order to lower a bridge. Run on it with the little brother, and send the big brother across to pick up a sheep. Carry that sheep back across and to the lower left where the bunnies are playing. Drop him in the coal, which will turn him black and unlock the Achievement.

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Bunny Buddies
You made the bunnies play nice.

•  Also in Chapter 1, at the exact same location as the Black Sheep Achievement, there's a white rabbit hopping among a group of black rabbits. Drop the white one in the coal to knock out this Achievement.

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Falling star
Make a wish.

•  As soon as you reach the cemetery near the beginning of Chapter 3, there will be a statue off to the right-hand side. Interact with it with the little brother for approximately six seconds. A star will go shooting across the sky, and the Achievement will unlock.

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A sad tune
You made someone feel better.

• This one's pretty morbid. At the beginning of Chapter 4, the path forks. Off to the right side, there's a guy who's, well, he's not having a very good time. Climb up the tree with the older brother, and let him down. Then, venture around the right side of the tree and work your way around the ledge. Grab the music box and give it to him. He's probably still bummed out, but you did everything you could. 

 

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Windpipe
You made the inventor dance.

• In Chapter 4, after raising the platform that the inventor's stranded on, there's a giant organ-type device in the upper-left part of his home. Turn the crank with the little brother and push the other part with the big brother until you hit the right tone. 

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Love Birds - Step Two
You re-united the two love birds.

• In Chapter 4, immediately before the hang-glider, there's a telescope that's impossible to miss. Look in the telescope, and zoom in on the lower-right. There will be two birds chilling out on a branch 

 

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Call of the giants
You sounded a giant horn.

• In Chapter 5, right before using the giant crossbow, go down the path to the right. Waiting there is a giant horn. The little brother is ineffectual, but the big brother has what it takes to make some noise.

 

 

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Behind the Curtain
You found a secret.

• At the start of Chapter 6, you'll hop in a canoe. At the end of the first straightaway, there'll be a "unique" waterfall off to the right. Go through it to earn this Achievement. 

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Turtle Soup
You helped the turtles to the sea.

• During Chapter 6, you'll come to an ice cavern which is home to a crying mama turtle. Off to the right are her babies, which have all found themselves in some sort of predicament. Pull one to the top of the giant slide and send him to his mother. There's another waiting to be slid down at the top of the slide. For the final turtle, the big brother will have to boost the little brother up. Once he's down, reunite him with his family. 

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Whale Song
You practised singing.

• In Chapter 6, immediately after climbing out of the ice cave that houses the family of turtles, you'll come across a two-man saw. Run past it, climb up a ledge, and a bench will be waiting. Take a seat on the bench, and the whales below will put on a show for you. 

 

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