Here is the full list of all 31 Shotgun Farmers trophies - there are 11 bronze, 14 silver, 5 gold and 1 platinum.
You have mastered all that it takes to be a Shotgun Farmer
Honk the horn of a tractor
Steal 100 Gnomes
Get 150 WatermeLMG kills
Get 150 Moolotov Kill
Get 500 Sniperagus Rifle Kills
Get 1000 Shovel Kills
Get 150 PK2 Kills
Get 1000 Shotgun Kills
Get 500 Peavolver Kills
Get 500 Gromato Launcher Kills
Get 500 Chilithrower Kills
Get 500 M6Bean kills
Get 150 Strawbowry kills
Get 500 Carrocket Launcher Kills
Survive 50 consecutive waves in Horde Mode
Score at least 10,000 points in a match
Score at least 15,000 points in a match
Survive 30 consecutive waves in Horde Mode
Survive your first wave in Horde Mode
Do your first rocket jump
Get a kill using the Sniperagus Rifle without using the scope
Jump across the traffic cones on Roadside without touching the ground
Score all the points in a Capture The Pig match
Ride a pig from the other team pen back to your team's pen without getting off
Hold on to the chicken for all 200 points during a match
Find out why horses don't like guns
Kill 5 enemy farmers using a Bombkin
Get the first kill in a match
Kill 3 farmers in a row
Harvest your first plant