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.
Complete "Pyrrhic Victory", "Old Wounds", "Time And Fate", and "Suffer With Me" in Veteran.
Crack the celerium worm.
A duel between rivals.
Complete all future levels in veteran.
Use a future weapon in the past.
Reinforcements on the way.
Plastic surgery avoided.
Stop the brutality inflicted by the PDF.
Successfully neutralize the SDC freighter at Keppel Terminal.
Successfully assassinate SDC Chairman Tian Zhao.
Successfully rescue HVI.
Successfully defend FOB Spectre from incursion.
Successfully escort the VIPs to safety.
Complete all challenges in Black Ops II.
Complete all challenges in a level.
Complete the campaign on Hardened or Veteran difficulty.
Collect all intel.
Minimum score of 10k in every mission.
Stop Menendez once and for all.
Jailor or executioner.
Escort the president to the secure location in downtown LA.
Interrogate Menendez.
Capture Menendez.
Only one can survive.
Capture Manuel Noriega and bring him to justice.
There are two futures.
Listen and think before you shoot.
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.