Here is the full list of all 24 XEL achievements.
Upgrade your Webshooter to the max.
Upgrade all Gadgets to the max.
Parry 100 times.
Collect all Health Seeds.
Parry for the first time.
Put an end to the madness.
Smash the revolution.
Collect all Stamina Seeds.
Collect all audiologs.
Master all cooking recipies.
Enter the Scorched Wasteland (without burning to crisp).
Upgrade your Sword to the max.
Solve the mystery of the Science Station.
Upgrade Chap to the max.
Upgrade your ZapTrap to the max.
Enter the Glacial Glades.
Enter the Bog.
Get your hands on the bio synth silk dispenser.
Travel to "that strange place" for the first time.
Defeat the rusty Overseer.
Upgrade Burnhilde to the max.
Upgrade your Clubber to the max.
End your adventure without any upgrades (except THAT ONE for Chap).
Collect all Achievements.