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