Here is the full list of all 19 Obscure II Obscure: The Aftermath achievements. It takes around 6-8 hours to unlock all of the achievements on Windows.
Finish the game.
Jedidiah won't make any more trouble.
Get to the main yard at Leafmore.
Find Sven.
Get to Jedidiah's house.
Recharge electric weapons 10 times.
Find Amy at the Fallcreek dam.
Over-consumption of tea is not recommended.
Go to the Delta Theta Gamma party.
Meet up with Kenny and Amy at the Delta Theta Gamma party
Find Corey's car and get to the hospital.
Find Jun.
Go through the hospital.
Open a chest.
Obtain every available weapon during a game.
Open all of the chests.
Prepare a serum, an improved serum and a powerful serum.
Consume 10 energy drinks.
Heal a teammate 10 times.