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