Here is the full list of all 9 Defiance & Mr. Good Looking achievements.
Get a dynamic duo medal
Unlock the secret character in E1M3
Find the Preacher’s Arm before fighting him
Finish Episode 1
Hear the conversation in E1M8
Find the Carmack Teleporter
Finish a Level on Hard
Obtain all 8 weapons and secondary fires from an Episode
Talk with all 8 special toilets in Episode 1