Here is the full list of all 27 Pandemic Express - there are Zombie Escape achievements.
Equip 'Hopeful One' set and play with him
Escape with the radio in the hands
Take home at last on zombies
Kill for mimic on any vehicle
Kill zombies on any vehicle
Take home at last on a human
Kill human with a mimic mine
Kill a human with a bomber
Open airdrop for your first time
Kill the last human in the match
First killed human
First successful escape
Hop on the train for your first time
First killed zombie
First match
Equip 'Lover' set and play with him
Complete tutorial
As human, blow up another human with a bomber
Equip 'Safety One' set and play with him
Equip 'Arrogant One' set and play with him
Equip 'Doubtful One' set and play with him
Equip 'Leader' set and play with him