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.
Stop the brutality inflicted by the PDF.
Minimum score of 10k in every mission.
Successfully assassinate SDC Chairman Tian Zhao.
Use a future weapon in the past.
There are two futures.
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.
Listen and think before you shoot.
Successfully rescue HVI.
Successfully escort the VIPs to safety.
Find the Karma weapon.
Successfully neutralize the SDC freighter at Keppel Terminal.
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.
Complete a level with customized loadout.
Investigate the jungle facility.
Complete 1 challenge in any level.
Rescue Woods.
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.
Complete all challenges in a level.
Complete the campaign on Hardened or Veteran difficulty.
A duel between rivals.
Crack the celerium worm.
Collect all intel.