Frogger

One of the problems is not having enough lives to practice level 5. However in the options menu you can increase your frog count to 7, you can't get the achievement with 7 frogs but you will have enough lives to learn the technique required. The first time I finished level 5 with 7 lives, I turned it back to 3 lives and got this achievement the very next go.

For level 5 it is all about the white lorries in the top lane of traffic - your only chance of making it across is when there is a break in these lorries. Sit back on the bank, don't even bother going out into the traffic until you can see the gap. Once you've done this a few times you'll have the level sussed.

level 4 is about the 2nd lane of traffic from the top.. when 3 white cars streak by jump into that lane, hit right and then you shuold be positioned to jump up between the lorries. It's a fast affair though, up,right,up,up.

Level five can be a bear to beat. If you take your time and notice the pattern between the semis and the purple sedans then you can make a quick dart across the race cars and be on to the water portion. Instead of logs and alligators, there is only alligators for the last row.

This game may require lots of practice. Quick movements are required to complete the higher levels. When cars are close together, wait until they have a slightly larger gap between them before you go. Also, when looking for that gap, make sure you are watching the row of cars above that and make sure you will not get hit by one of those cars. The cars and logs always appear with patterns. After practicing for much time, these patterns may become more obvious. After you have recognized the patterns for cars, logs, and enemies for all levels from 1 - 5, you will just need to practice a little more and you will probably unlock the achievement soon.

Taken from x360a and you can do it offline with 7 lives :)
1. Clear system cache.
2. Start frogger when asked to update, cancel.
3. Go to "Help and Options" then select "Settings" change your lives to 7 press accept. 
4. Select done. You're then back on the main menu. If you scroll up to Arcade Game but do not press A it says to the right "Note: Settings changed. Scores will not be uploaded."
5. Press guide button and exit to the dashboard.
6. Go back into frogger again select "No" to the update.
7. Now your back at the main menu but you don't have the note to the right.
8. Press A to start a new game it then brings up another box for you to sign in just select your gamertag. Selct "No" again to the update and your ready to go. Don't worry if you lose all seven lives just stay in the game and start a new game.