Here is the full list of all 14 LONE WOLF: Horizon achievements.
Kill 100 enemies.
Kill 10 enemies.
Go to the moon of Alice-43b.
Return to Earth.
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.
Buy from a merchant.
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.