Here is the full list of all 29 Convoy achievements.
Spend 10000 fuel in total
Win 10 consecutive battles with only the MCV in your convoy
Defeat the boss on hard difficulty
Steal some vehicles from a TORVAK base
Have 2000 bolts to spare
Kill 1000 enemies in total
Defeat Andy
Defeat the boss with only light vehicles
Defeat the boss without doing any side objectives or radio signals
Defeat the TORVAK miniboss
Get shot over a compression coil
Defeat the boss without using Machine Guns, Cannons or Rocker Launchers
Win the jackpot in the Lucky Peacock slotmachines
Defeat the dragon
Defeat the Raider miniboss
Defeat the boss without firing a shot
Deliver all ship parts in a single drop
Travel 6000 KM in a single run
Win a combat without firing a shot
Defeat the boss without using Laser, Plasma or Railgun weapons
Fully upgrade 4 units and the MCV in a convoy
Kill an enemy without taking any damage
Kill 250 enemies in total
Defeat the boss
Defeat the boss on medium difficulty
Kill 35 enemies in a single run
Defeat the Privateer miniboss
Have an enemy unit kill another enemy unit
Complete twenty scenarios