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.
Complete all challenges in a level.
Collect all intel.
Complete all future levels in veteran.
Complete "Pyrrhic Victory", "Old Wounds", "Time And Fate", and "Suffer With Me" in Veteran.
Reinforcements on the way.
Crack the celerium worm.
Use a future weapon in the past.
Stop the brutality inflicted by the PDF.
A duel between rivals.
There are two futures.
Minimum score of 10k in every mission.
Successfully assassinate SDC Chairman Tian Zhao.
Successfully rescue HVI.
Successfully escort the VIPs to safety.
Successfully neutralize the SDC freighter at Keppel Terminal.
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.
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 a level with customized loadout.
Complete 1 challenge in any level.
Rescue Woods.