Here is the full list of all 35 Call of Duty: Black Ops II achievements. It takes around 30-35 hours to unlock all of the achievements on Windows.
Reinforcements on the way.
Crack the celerium worm.
Stop the brutality inflicted by the PDF.
Successfully defend FOB Spectre from incursion.
Complete all challenges in Black Ops II.
Complete all challenges in a level.
Minimum score of 10k in every mission.
There are two futures.
Listen and think before you shoot.
Collect all intel.
Use a future weapon in the past.
Successfully escort the VIPs to safety.
Successfully rescue HVI.
Successfully neutralize the SDC freighter at Keppel Terminal.
Successfully assassinate SDC Chairman Tian Zhao.
Complete all future levels in veteran.
Only one can survive.
Complete "Pyrrhic Victory", "Old Wounds", "Time And Fate", and "Suffer With Me" in Veteran.
Plastic surgery avoided.
Complete the campaign on Hardened or Veteran difficulty.
Stop Menendez once and for all.
Jailor or executioner.
Escort the president to the secure location in downtown LA.
Interrogate Menendez.
A duel between rivals.
Capture Menendez.
Capture Manuel Noriega and bring him to justice.
Find the Karma weapon.
Gather information on Raul Menendez' suspected terrorist plot.
Take down Menendez and his operation.
Gather intel on Raul Menendez from Mullah Rahmaan.
Complete 1 challenge in any level.
Investigate the jungle facility.
Rescue Woods.
Complete a level with customized loadout.