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