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.
Collect all intel.
Crack the celerium worm.
Complete all challenges in a level.
Complete all future levels in veteran.
Minimum score of 10k in every mission.
Use a future weapon in the past.
A duel between rivals.
Complete "Pyrrhic Victory", "Old Wounds", "Time And Fate", and "Suffer With Me" in Veteran.
Complete the campaign on Hardened or Veteran difficulty.
Stop the brutality inflicted by the PDF.
Reinforcements on the way.
Successfully assassinate SDC Chairman Tian Zhao.
Successfully rescue HVI.
There are two futures.
Successfully escort the VIPs to safety.
Successfully neutralize the SDC freighter at Keppel Terminal.
Plastic surgery avoided.
Listen and think before you shoot.
Only one can survive.
Jailor or executioner.
Stop Menendez once and for all.
Escort the president to the secure location in downtown LA.
Complete all challenges in Black Ops II.
Interrogate Menendez.
Successfully defend FOB Spectre from incursion.
Capture Menendez.
Capture Manuel Noriega and bring him to justice.
Find the Karma weapon.
Take down Menendez and his operation.
Gather information on Raul Menendez' suspected terrorist plot.
Gather intel on Raul Menendez from Mullah Rahmaan.
Investigate the jungle facility.
Complete a level with customized loadout.
Rescue Woods.
Complete 1 challenge in any level.