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