Here is the full list of all 48 Time Survivors achievements.
Reach Level 66 with Nik in any stage
Reach 25% in the Meta progression
Complete "The Dark Age" stage
Meet the Mortician
Kill 10 T-Rexes
Deal a total of 500.000 damage with any fire weapon
Kill 1000 scarabs
Use the Red Leech for more than 600 seconds in total
Upgrade Telescope to maximum level
Upgrade Ice Orb to max level during a run
Defeat 3 Cerberi in a single run
Recover 2000 Health Points by any means
Walk 20 Km
Upgrade Slingshot to max level during a run
Upgrade Amoeba to max level during a run
Reach minute 14:40 in The Dark Age stage
Use the Tesla Coil for more than 600 seconds in total
Find 3 Magic Mushrooms
Kill 222 Evil Priests
Meet your first huge monster dog, the Barghest
Death is the way
Play a run in the full "Time Survivors"
Defeat a total of 5000 enemies
Get 5 Apples
Find 3 Giga Magnets
Kill 2023 enemies
Survive 6 minutes with Claire
Get 300 gold
Destroy 20 vases
50 Gold turns into 100. Buy upgrades at the Shop!
Reach Level 10 with any character
Reach Level 5 with any character
Deal a total of 1.000.000 damage with the Shuriken
Reach level 16 with Mulan in "The Stone Age" stage
Kill 96 Triceratops
Survive 5 minutes with Ned
Complete the Egypt Age stage
Reach Level 10 with Ned
Complete "The Egypt Age" stage
Upgrade Plasma Gun to max level during a run
Upgrade Shuriken to max level during a run
Survive 20 minutes with Ned
Kill the flying Pyramid
Survive 20 minutes as Cleo
Reach 50% in the Meta progression
Reach 75% in the Meta progression
Reach 100% in the Meta progression
Reach minute 5:55 in The Ice Age stage