  We extend previous ab initio calculations of lanthanide opacities (Fontes et
al., 2020, MNRAS, 493, 4143) to include a complete set of actinide opacities
for use in the modeling of kilonova light curves and spectra. Detailed,
fine-structure line features are generated using the configuration-interaction
approach. These actinide opacities display similar trends to those observed for
lanthanide opacities, such as the lighter actinides producing higher opacity
than the heavier ones for relevant conditions in the dynamical ejecta. A
line-binned treatment is employed to pre-compute opacity tables for 14 actinide
elements $(89 \le Z \le 102)$ over a grid of relevant temperatures and
densities. These tabular opacities will be made publicly available for general
usage in kilonova modeling. We demonstrate the usefulness of these opacities in
kilonova simulations by exploring the sensitivity of light curves and spectra
to different actinide abundance distributions that are predicted by different
nuclear theories, as well as to different choices of ejecta mass and velocity.
We find very little sensitivity to the two considered distributions, indicating
that opacities for actinides with $Z \ge 99$ do not contribute strongly. On the
other hand, a single actinide element, protactinium, is found to produce faint
spectral features in the far infrared at late times (5-7 days post merger).
More generally, we find that the choice of ejecta mass and velocity have the
most significant effect on KN emission for this study.
