After grabbing the dragon in your second visit to the first area, fly over to the basketball court near the giant cow. You will see 4 black cows running around in the court. Use your Dragon's fire breath on all of them to turn them into hamburgers.
Timestamps:
00:00 - Intro
00:20 - Self Sacrifice Trophy
00:48 - Dead or Deer Trophy (Start)
01:00 - Deer Hunting Trophy (Start)
02:05 - Counting Sheep Trophy (Start)
02:46 - Dead or Deer Trophy (Unlock)
05:36 - God Disguised as a Cow Trophy
06:15 - Kept You Waiting? Trophy
09:00 - Town Musicians of Bremen Trophy
11:55 - Deer Hunting / Counting Sheep Trophy (Continued)
15:15 - Counting Sheep Trophy (Unlocked)
15:50 - Deer Hunting Trophy (Unlocked)
19:50 - Final Boss Fight
23:10 - The Trudeer Show Trophy
26:10 - Like A Truck Trophy
26:50 - Dunkleosteus Trophy
27:10 - 100% Beef Trophy27:40 - The Divine Move Trophy
29:05 - Genius Trophy
31:20 - Big Time Monkey Trophy
32:28 - Rhinosaber Trophy
33:23 - 13th Deer & I Am DEEEER Trophy