Grand Theft Auto 4 (GTA 4) Message Board  

hello again! i want to know how to complete the game by 100%? and if i use cheat codes it may block some missions? thank you!

You can complete 100% by using all missions and all bonus missions (like kill all birds,deliver all cars etc.)
Some cheats will block achievements but not the missions.
Also you can get 100% with cheats but you won't get some achievements.

Getting 100% completion

The following is a list of how to get a 100% completion:

Successfully complete all 90 story and procedural missions to get 68% complete.

Successfully complete all 30 vehicle thefts to get an additional 2%.

Successfully complete all 50 stunt jumps to get an additional 2.5%.

Collect all 200 pigeons (flying rats) to get an additional 2.5%.

Find all random characters and complete their missions to get an additional 5%.

Successfully complete all 20 vigilante crimes to get an additional 2.5%.

Kill all 30 people on the list to get an additional 2.5%.

Beat friends or computers at every activity to get an additional 5%.

Get all your friend's special abilities and do all their activities to get an additional 10%. Note: This does not include Dwayne or Roman.

Here's a checklist of everything to do.

Link

You also can see it here
Link

ahh dont u know what are the archivments for ? i raelly dont know ?

Are you asking what the achievements are for? haha

yeah, what are they for? what do you earn on it? just a shiny goblet to keep on the shelf?