Here is the full list of all 40 Life is Strange: True Colors achievements. It takes around 15-20 hours to unlock all of the achievements on Windows.
Find the “Valkyrie's Dish” Memory in Chapter 3
Find all Memory Collectibles in Chapter 3
Find all Memory Collectibles in Life is Strange: True Colors™
Find the “Old Paper” Memory in Chapter 3
Find the “Appointment Slip” Memory in Chapter 3
Find the “Dollar” Memory in Chapter 3
Find the “Bomber Jacket” Memory in Chapter 3
Find all Memory Collectibles in Chapter 2
Find the “T-Shirt” Memory in Chapter 2
Find the “Button” Memory in Chapter 2
Find the “Umbrella” Memory in Chapter 2
Find the “Rent Check” Memory in Chapter 2
Find the “Gummies” Memory in Chapter 2
Find the “Microphone” Memory in Chapter 4
Find all Memory Collectibles in Chapter 4
Find the “Phone” Memory in Chapter 1
Find all Memory Collectibles in Chapter 1
Find the “Helmet” Memory in Chapter 1
Find the “Business Card” Memory in Chapter 1
Find the “Crack” Memory in Chapter 1
Find the “Riley Letter” Memory in Chapter 1
Complete Chapter 5 of Life is Strange: True Colors™
Find the “Bomber Jacket” Memory in Chapter 5
Find all Memory Collectibles in Chapter 5
Find the “Pendant” Memory in Chapter 5
Find the “Guitar Strings” Memory in Chapter 5
Find the “Business Card” Memory in Chapter 5
Find the “Mom's Keys” Memory in Chapter 5
Complete Chapter 4 of Life is Strange: True Colors™
Find the “Drum Kit” Memory in Chapter 4
Find the “CIT Sticker” Memory in Chapter 4
Find the “Polaroid” Memory in Chapter 4
Help the Jelly Bean Counter win the contest
Find the “Pressed Rose” Memory in Chapter 4
Complete Chapter 3 of Life is Strange: True Colors™
Find and play the Student's lost song
Complete Chapter 2 of Life is Strange: True Colors™
Help the Hoodie Guy find his dog
Help the Birdwatcher find her bird
Complete Chapter 1 of Life is Strange: True Colors™