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 all challenges in Black Ops II.
Collect all intel.
Complete all challenges in a level.
Minimum score of 10k in every mission.
Successfully rescue HVI.
Reinforcements on the way.
Crack the celerium worm.
Successfully assassinate SDC Chairman Tian Zhao.
There are two futures.
Successfully escort the VIPs to safety.
Plastic surgery avoided.
Stop the brutality inflicted by the PDF.
Successfully neutralize the SDC freighter at Keppel Terminal.
Successfully defend FOB Spectre from incursion.
Use a future weapon in the past.
A duel between rivals.
Stop Menendez once and for all.
Complete all future levels in veteran.
Complete the campaign on Hardened or Veteran difficulty.
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.
Complete "Pyrrhic Victory", "Old Wounds", "Time And Fate", and "Suffer With Me" in Veteran.
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.