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