Countless people on map chat and the forums are having similar issues so I figured I would consolidate my responses into a single thread.
General Tips:
Read the in-game mail that is sent to you. It usually points you in the initial direction for the current living story. If you did not receive it, or deleted it, log on to a different character.
There are heralds in the game (I believe they have the scroll icon on the map in town) who will give further advice. There are scouts at most zone entrances that do the same as well.
When doing achievements, READ the achievement entirely. People often skim the achievement, can’t complete them as a result, and the complain them to be bugged.
Physically make a list of what you have completed if you have to do multiple objectives for an achievement that are not individually tracked. Examples would be dungeon master and diving master.
Read the patch notes
Read the starter guide Anet created and other guides people created if you’re stuck.
For the current Living Story:
Access to the Pavilion is regained once you complete Emissary Vorp’s achievements and completed the Funhouse. You may not have to complete the funhouse but I haven’t tested it.
The achievements that have you complete invasions for Clockwork and Vorp require them to be on DIFFERENT maps. Essentially you must complete invasions on 13 unique maps to finish the achievements that involve this.
The Funhouse is available after you finish Vorp’s achievements.
You cannot start collecting components for Vorp until you completed five UNIQUE invasions first.
Swift Closer achievement is gained by participating (and receiving credit) for five portal events within 15 minutes of closing the first. Some state you should have a buff but I never noticed it.
Make a list of every invasion that you completed. This is so you don’t accidentally do one you’ve already done hoping for credit.
Pavilion and Gauntlet still are available until Sept 3rd
Tips for the invasions:
Split up into smaller groups to do the events. You cover more ground and they don’t scale up too much. This is more important on higher level maps such as Frostgorge.
Don’t attack Scarlet until after the third wave
Don’t attack mobs after the dynamic event completes. Completing the events decreases the bar quicker.
Don’t kill groups of mobs that you don’t need to. If you already depleted the bar for Aetherblades, don’t attack them anymore.
Call out bugged events so people don’t keep going to them. Frostgorge is full of them.