I have noticed there aren't a lot of guiding lines for Achievements
on the Internet, so I might as well write one for you.
1. PaleozombologyComplete Act 3 by defeating the boss without the forklift.
In order to get this achievement, you have to complete the level of act 3, and it is impossible to move on without using any forklift
. My best advice, don't hit the big dinosaur with any weapons you have besides surrounding it with your alliances.
2. Occupy Town HallComplete all 20 blocks in Town Hall Survival.
If you're tired of starting all over again, then you've got to have a good sense in order to get this achievement. Should you feel you will not be able to finish a level, leave the level before you're sentenced "death". By doing so, you can continue the same level over and over until you manage to finish it.
3. Con-GRAVE-ulationsComplete all 10 blocks in Graveyard Survival.
Refer to the above suggestion.
4. Grand Theft AutoOpen 20 vehicles.
Cars can most be found in the late stage of any level. Try Act 1 level 5. The fastest way to get this achievement is to open the car and restart the block. Keep restarting until you get 20 vehicles.
The above 4 achievements are the hardest in my mind and I think those required some advices. Should you need any help, feel free to comment. Good Luck!