Here is the full list of all 14 LONE WOLF: Horizon achievements.
Buy from a merchant.
Kill 10 enemies.
Kill 100 enemies.
Return to Earth.
Go to the moon of Alice-43b.
Have 1 million dollars in the bank.
Get to the end of the credits after the Earth level.
Upgrade a weapon at the Eos Upgrade Station.
Kill 20 United World Army Soldiers.
Have 5 million dollars.
Complete the game, but only kill one enemy soldier.
Don't die at all before going back to Earth.
Kill 500 enemies.
Never upgrade your base throughout the entire game.