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 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.
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.
Plastic surgery avoided.
Take down Menendez and his operation.
Stop the brutality inflicted by the PDF.
Gather intel on Raul Menendez from Mullah Rahmaan.
Rescue Woods.
Investigate the jungle facility.
Complete 1 challenge in any level.
Complete a level with customized loadout.
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.
Successfully neutralize the SDC freighter at Keppel Terminal.
Successfully escort the VIPs to safety.
Successfully defend FOB Spectre from incursion.
Successfully assassinate SDC Chairman Tian Zhao.
Successfully rescue HVI.
A duel between rivals.
Reinforcements on the way.
Crack the celerium worm.
Collect all intel.
Use a future weapon in the past.
Minimum score of 10k in every mission.