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Tog_Imlame idkfa (to increase the gun to level 5)
Tog_ImLame give TOG_Powerup_Gun_bCritical (to get critical hits)
Ghost (to get to the boss without shooting).
The mines will do extra damage. I destroyed the boss in 13 shots, got to shoot a 14th before ending the level to get the achievement.
You can just ghost walk to the exit room after the boss, then use walk to complete the level and the achievement procs. You don't have to fight the boss.