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