Here is the full list of all 101 Little hidden city achievements. It takes around 0-1 hour to unlock all of the achievements on Windows.
the end of the game
find water_motocycle
find bicycle
find TV
find air conditioning
find tractor
find football_ball
find swing
find flower_palicious
find satellite_talk
find power station
find pointer
find cat
find telescope
find gazebo
find sculpture_rock
find traffic light
find electric car
find VOLGA
find camera
find medical bed
find wheelchair
find basketball
find inflatable pool
find statue
find solar_battery
find motorcycle
find slide
find boat_old
complete a level gas station
find part of the train
find haystack
find muffler
find hovel
find canister_2
find extinguisher
find old car
find engine
find army trailer
find spare part
find wheel
find strut
find barrel
find wheel_2
find logs
find soona
find equipment for garage
find canister
find Jack
pass_level_supermarket
find handbag_female
find stool
find bank_register
find shoe
find carton
find steak_sibs
find drawer
find sink
find basket
find jacket
find bucket_washing brush
find soft toy
find eggplants
find cake_shocolate
find fish
find pac_products
find watermelon
find trolley
find moped
find bananas
pass_level_country house
find tools
find watering can
find log
find light
find stairs
find plant_in_roof
find potty
find watering can_2
find Boots
find bucket of apples
start the game
pass_level_busstation
find newspaper
find suitcase_02
find stroller
find bottles
find shoes
find nameplate
find suitcase_opened
find bicycle_old
pass_level_apartment
find tube
find strap
find bag
find suitcase
find book
find coat
find umbrella
find magnifying_glass
find hat