That's Definitely Not A Knife Trophy
That's Definitely Not A Knife
In the Rats of Tobruk, bring down the Stuka with a pistol, grenade, or rocketMission 7: Rats of Tobruk
You start the mission with a pistol, keep it with you until you need to take down that plane, which is at the end of the mission. You can also get rocket launchers from some enemies or grenades but funnily enough, it's easier to attempt this trophy with a pistol.
At the end of the mission, you'll have the objective to take down a plane. Keep shooting at it with your normal weapons, after a while some enemies will spawn in the area and they will carry MG guns, kill them and pick up their gun to deal great damage to the plane. When the plane starts to burn, switch to your pistol and shoot at the plane when he's coming at you. After a couple of attempts, the plane will explode and as long as the final shot was from a pistol your trophy will pop just fine.