If you start up the game and for some reason all chapters are gone except the beginning one, do not panic, your save file is most likely intact; your experience points, upgrade points, and shards collected are still there.

The developer provided workaround here.
http://www.tankuniversal.com/forum/viewtopic.php?f=4&t=90

In order to continue playing with previously gained experience and upgrade points, make sure to select your profile and load the beginning chapter. Once the game finishes loading, open console with tilde key and type in warp command. Note that If you use warp command at the game menu, it will automatically create anonymous profile and you start with rank 1.

If you ever need to back up your save file, it is located in your Steam folder.
(steamapps\common\Tank Universal SteamWorks Edition\SAVES)

All achievements not mentioned in this guide are straightforward and easily attainable by playing the campaign and probably a few additional skirmish games.

Below are the solutions to tricky achievements.

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It is not necessary to replay the entire game on different difficulties.
Just replay the very last chapter, 21 - Awards Ceremony.

Load the final chapter, watch the cutscene of the resistance hailing you for ultimate victory. Right after the cutscene, go to game option and change difficulty, resume the game and talk to the Council to receive a medal of corresponding difficulty. Repeat for other difficulty achievements.

This is straightforward and you will attain higher ranks as you progress in the campaign. But if you were not able to reach maximum rank by the end of the game, open console and warp to any previous chapters and complete them again to get more experience points. Alternatively you could play additional skirmish games.

Note that if you select previous chapters from game menu, rank will revert to the moment before you completed that mission. So, it is necessary to load the final mission that remembers your most recent (highest) rank and use warp command from there.

Chapter 13 - Wastering

Spam spacebar very hard.
Maintain your camera view parallel to the sheep (center view).
If you move your mouse around too far, you will lose balance and fall off the sheep.

If you fail, you have to restart the chapter from game menu and try again.

Glyph Freak Deluxe only can be done in chapter 19 - Logic Gate.

This achievement is the trickiest and most time consuming one. Don't get confused between converted and collected. You can destroy Red base and steal Red Alpha key but DO NOT deliver it to your base yet. Two Behemoths and occasional enemy tanks will continue spawning through the colossal gate and they destroy your allies for indefinite time until you turn in the key. Your two harvesters will continue to collect glyphs to reinforce your allies and this is where the collected glyphs count towards the achievement. It has to be done in one sitting so you can just idle around a few hours till you get the achievement. You can go AFK but I advise you to stay near glyphs so your ally tanks will proactively convert neutral glyphs that spawn.

Ideas are collected from the discussions below. Thanks to everyone who participated.

Glyph Freak Deluxe - How exactly is this one obtained?
http://gtm.steamproxy.vip/app/19200/discussions/0/864971765969354910/

Thread: Length to 100%
http://gtm.steamproxy.vip/app/19200/discussions/0/624075374577730762/

Chapter 08 - Evacuation

Apart from Glyph Freak Deluxe, this one is the hardest achievement.
You need to be fast and accurate to kill all enemy tanks and spotters from distance.
A bit of luck is required too as enemies have inconsistent accuracy.

If you have hard time unlocking this achievement, use console command for 99 shards and rocket-spam the ♥♥♥♥ out of those ♥♥♥♥♥♥♥♥♥♥♥♥♥.

fin