Complete the indicated task to unlock the achievement.

Achievement	How to unlock
Apprentice	Read one book.
Beizel	Kill Beizel.
Brotherly instinct	Find Michael, your brother.
Coloth	Kill Coloth.
End of watch	Finish Prologue.
Engineer	Repair the tank.
First blood	Kill one Infected.
First step	Meet Dr. Andre Gratia.
Ghunter	Kill Ghunter.
Gobber	Kill Gobber.
Julia	Meet Julia.
Linger	Kill Linger.
Realdead Man	Kill Realdead Man.
Vilebyrd	Kill Vilebyrd.