Here is the full list of all 44 Destroy All Humans! 2 - there are Reprobed achievements.
Collect all songs
Collect all posters
Complete all optional mission objectives (use the Holopoxdeck if you have to)
Demolish a public toilet on each map
Collect all Alien Artifacts
Complete all odd jobs
Find the hidden basketball on the moon and score a hoop with PK Slam
S.K.A.T.E. from the Blisk dome to the base's entrance 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. 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
Unlock all Gene Blender upgrades
Destroy the crab behind the curtain
Use your saucer's weapons to scare human cattle out of their hidden hives on each map
Outrun Blisk Spores with S.K.A.T.E.
Destroy a crusty old cryptid in Tunguska
Kill a reincarnated guru with his own body
Destroy a washed-up scammer in Takoshima
Summon Arkvoodle and take hold of his vibrating super-weapon
Throw a cop through a donut with PK
Drop a human from the top of Albion Bridge by cancelling PK
Invade Solaris
Destroy an old foe in Tunguskan ship-to-ship battle
Invade Tunguska
Destroy a familiar-looking monster in Takoshima
Phone home
Re-visit a mission in the Holopoxdeck at a saucer landing zone
Invade Takoshima
Destroy a majestic presence in Albion
Use a Furotech Reactor to purchase a capstone upgrade in the Pox Mart
Destroy a dastardly double agent in Albion
Score three perfectly-timed Anal Probes in a row
Invade Albion
Complete your first steps on the Path of the Sacred Crotch
Destroy a tool in Bay City
Upgrade your saucer in the Pox Mart at a saucer landing zone
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
Rifle through your Furonigami collection
Line up three humans with the Dislocator and send them sprawling
Invade Bay City