Here is the full list of all 24 XEL achievements.
Upgrade your ZapTrap to the max.
Upgrade Chap 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.
Solve the mystery of the Science Station.
Enter the Scorched Wasteland (without burning to crisp).
Smash the revolution.
Put an end to the madness.
Collect all Health Seeds.
Collect all Stamina Seeds.
Upgrade your Sword to the max.
Upgrade your Webshooter to the max.
Upgrade Burnhilde to the max.
Upgrade your Clubber to the max.
Upgrade all Gadgets to the max.
Master all cooking recipies.
Parry for the first time.
Parry 100 times.
Collect all audiologs.
End your adventure without any upgrades (except THAT ONE for Chap).
Collect all Achievements.