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