Here is the full list of all 44 Destroy All Humans! 2 - there are Reprobed achievements.
Complete all optional mission objectives (use the Holopoxdeck if you have to)
Collect all songs
Collect all posters
Unlock all Gene Blender upgrades
Collect all Alien Artifacts
Destroy a dastardly double agent in Albion
Kill a reincarnated guru with his own body
Use your saucer's weapons to scare human cattle out of their hidden hives on each map
Complete all odd jobs
Destroy a washed-up scammer in Takoshima
Summon Arkvoodle and take hold of his vibrating super-weapon
Score three perfectly-timed Anal Probes in a row
S.K.A.T.E. from the Blisk dome to the base's entrance without interruption
S.K.A.T.E. from Parliament to the Russian embassy without interruption
S.K.A.T.E. from the landing zone near Tarkovskoye along the tracks to the East without interruption
S.K.A.T.E. up the road to Coit Tower without interruption
Throw a cop through a donut with PK
Phone home
Find the hidden basketball on the moon and score a hoop with PK Slam
Demolish a public toilet on each map
Re-visit a mission in the Holopoxdeck at a saucer landing zone
Rifle through your Furonigami collection
Destroy a crusty old cryptid in Tunguska
Drop a human from the top of Albion Bridge by cancelling PK
S.K.A.T.E. from the temple gates through the park to Takoshima City without interruption
Ascend Takoshima Tower
Destroy the crab behind the curtain
Line up three humans with the Dislocator and send them sprawling
Invade Solaris
Destroy an old foe in Tunguskan ship-to-ship battle
Invade Tunguska
Upgrade your saucer in the Pox Mart at a saucer landing zone
Destroy a familiar-looking monster in Takoshima
Invade Takoshima
Destroy a majestic presence in Albion
Outrun Blisk Spores with S.K.A.T.E.
Invade Albion
Complete your first steps on the Path of the Sacred Crotch
Use a Furotech Reactor to purchase a capstone upgrade in the Pox Mart
Upgrade Crypto in the Pox Mart at a saucer landing zone
Destroy a tool in Bay City
Try out a new look for Crypto in the Cloning Chamber
Accelerate Brain Extract, Body Snatch, Transmog or Drain by mashing that button like you mean it
Invade Bay City