Here is the full list of all 14 Hypertrain achievements.
Upgrade a village to a city.
Upgrade a city to a metropolis.
Reach a length of 25.
Become the longest train.
Beat an on-road time trial.
Beat an off-road time trial.
Successfully complete a cargo mission.
Successfully complete a passenger mission.
Successfully complete a kill mission.
Drive at 1000kmph.
Complete a passenger mission with 20 passengers.
Complete 20 kill missions in one game.
Win the game without dying.
Win the game before day 5 ends.