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