Not sure if this is what you are looking for, I found it in the tf_english.txt
"TF_Unique_Achievement_Bat" "The Sandman"
"TF_Unique_Achievement_Scattergun_Double" "The Force-A-Nature"
"TF_Unique_Achievement_EnergyDrink" "Bonk! Atomic Punch"
I didn't find them next to the other weapons, They were some rows below.
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