-Estimated achievement difficulty: 8/10
-Offline: 12/12 (200)
-Approximate amount of time to 200: 6-10 Hours
-Minimum number of playthroughs needed: 1
-Number of missable achievements: None
-Do cheat codes disable achievements? No Cheats
-Does difficulty affect achievements? 1 (for beating one episode on extreme difficulty without dying).
-Glitchy achievements: None
-Unobtainable achievements: None
-Extra equipment needed? A second controller for Chaser achievement.
This game uses the right analogue stick for shooting and the left analogue stick for navigation. It takes place entirely on water, and features many perk type upgrades and 3 different ships with different weapons, armor, and speed. It's a very easy game for at least 180 achievement points, but most people won't give the last 20 much more than a few attempts.
Step 1: Campaign
You will gain almost all of your achievements here. Play through the game on the easiest difficulty which will unlock extreme. Now replay any episode without dying while on extreme difficulty. There are a total of 21 collectibles which are golden and are a boat/ship's steering wheel (or helm). They are all very easy to find and you can replay chapters if you missed one, as well as check your progress on what you have per level.
Step 2: Local Multiplayer
Set up a local multiplayer game of Chaser in the main menu. You can play against your 2nd controller and win against it easily for the achievement associated with this mode.
Step 3: Skirmish
You must play Skirmish and have cleared at least wave 25. You can start at wave 19 if you want. Check HERE for a more detailed solution. This is the hardest achievement in the game and is the sole reason the difficulty is so high.
The game's achievements are pretty straight forward and the collectibles aren't hard to find. The problem you will face is the Skirmish mode which will test your patience. The best advice is to be patient and to keep trying. If you manage to complete it, you'll be one of the few with a completion in this game.