Here is the full list of all 26 Confederate Express achievements.
Complete a scene
Complete a season
Mutate all civilians
Finish game with less than 70% casualties
Complete a scene without moving
Catch a cat
Finish game with a single ability
Finish game in under 20 minutes
Complete a scene with a single click
Obtain membership card before scene 21
Save up 5000 bounty
Obtain Entropy Filter before scene 8
Deliver package to its destination
Buy 3 items from the same ATM
Kill 10 enemies in an explosion
Finish game without missing bounty
Exterminate all life forms
Complete a scene with someone sleeping
Pet a cat without startling it
Dash into a cloaked Stalker
Game the System
Receive a 5 star rating
Finish game without losing any health
Reach level 10 with no civilian casualties
Finish game with Hardcore item