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.
Reinforcements on the way.
Crack the celerium worm.
Minimum score of 10k in every mission.
Successfully assassinate SDC Chairman Tian Zhao.
Stop the brutality inflicted by the PDF.
Successfully rescue HVI.
Use a future weapon in the past.
Complete all future levels in veteran.
A duel between rivals.
Complete "Pyrrhic Victory", "Old Wounds", "Time And Fate", and "Suffer With Me" in Veteran.
There are two futures.
Plastic surgery avoided.
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.
Listen and think before you shoot.
Find the Karma weapon.
Successfully escort the VIPs to safety.
Successfully defend FOB Spectre from incursion.
Successfully neutralize the SDC freighter at Keppel Terminal.
Gather information on Raul Menendez' suspected terrorist plot.
Take down Menendez and his operation.
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.