Here is the full list of all 20 Bread & Fred achievements.
Complete the game at 100%
Talk to every NPC (Both modes)
Collect all photos
Complete "The Peak" mission
Complete all misions
Complete "Fishy Mines" mission
Complete "Friendly Foothils" mision
Compltete the Manual
Bring Jeff to the top (Complete Singleplayer)
Reach the top in less than 2 hours
Complete "Windy Winds" mission
Pass the ball 5 times without it touching the floor
Reach the top (Complete Multiplayer)
Reach the "Last Breath"
Fall more than 100m
Reach the "Windy Winds"
Complete 100m without falling
Reach the "Fishy Mines"
Run out of stamina
Win 3 "Rock, Paper, Scissors" games