Full list of all 25 Her Majesty's SPIFFING achievements worth 1,000 gamerscore. It takes around 1-2 hours to unlock all of the achievements on Xbox One.
Place washing liquid inside washing machine before it's activated
Maybe it was earth all along?
Observe Schrödinger's cat both alive and dead
Break a sweat when using the treadmill
Give Sub Lieutenant Jones English's tea
Complete Her Majesty's SPIFFING: The Empire Staggers Back
Acquire a second block of cheese
Fail to catch a frog even when they are asleep
Summon the Power of Greyskull to distract Antoine and Pierre
Examine all the rocks on the planet surface
Locate the French camp while driving the Beagle Two Too
Find a replacement motor, when asked
Look intently at Sub Lieutenant Jones
Soothe a group of frogs to sleep
Save game progress using the typewriter
Use the ladder like a boss
Wake up Sub Lieutenant Jones
Ensure no one can erase the driver
Crush a table top football player
Crash into ejected fuel cell when at the controls of the HMSS Imperialise
Locate the paperclip
Attempt to mix washing up liquid and tea
Talk to G.E.R.T.E.A. about British villains
Examine the Gravity Simulation Switch
Commence your mission on board the HMSS Imperialise!